Logo UNIPVM

Luca PIERANTONI

Pubblicazioni

Luca PIERANTONI

 

233 pubblicazioni classificate nel seguente modo:

Nr. doc. Classificazioni
140 4 Contributo in Atti di Convegno (Proceeding)
89 1 Contributo su Rivista
3 2 Contributo in Volume
1 5 Altro
Anno Risorsa
2021 Heterodyne Phase Shifting Method in ScanningProbe Microscopy
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. A, OPTICS, IMAGE SCIENCE, AND VISION
Autore/i: Di Donato, Andrea; Fabi, Gianluca; Mencarelli, Davide; Pierantoni, Luca; Morini, Antonio; Farina, Marco
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/287411 Collegamento a IRIS

2021 Fabrication of ring oscillators using organic molecules of phenacene and perylenedicarboximide
RSC ADVANCES
Autore/i: Fioravanti, Niko; Pierantoni, Luca; Mencarelli, Davide; Turchetti, Claudio; Hamao, Shino; Okamoto, Hideki; Goto, Hidenori; Eguchi, Ritsuko; Fujiwara, Akihiko; Kubozono, Yoshihiro
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/288023 Collegamento a IRIS

2020 Cosec2 hybrid travelling/resonant antenna for maritime surveillance applications
IET MICROWAVES, ANTENNAS & PROPAGATION
Autore/i: Morini, A.; Mencarelli, D.; Farina, M.; Pierantoni, L.; Malaspina, V.
Classificazione: 1 Contributo su Rivista
Abstract: In this contribution, the authors present guidelines for an effective design of an X-band 2D array of slotted waveguides for surveillance applications. The radiation pattern, with a narrow beam and cosec2 profile, respectively, in azimuth and in elevation, is obtained by a beam forming network based on a hybrid architecture, in which the main corporate feed line feeds identical 11-element travelling wave slotted arrays. The latter produces a radiation pattern that is frequency-independent in azimuth and only slightly frequency-dependent in elevation. The fabricated antenna features a horizontal beam width (at -3 dB) of 1.16°, gain >31 dBi, and 30 dB sidelobe level in the 300 MHz operative band. The overall array is made up of three stacked layers: the first two for the corporate feed line and the third for the travelling wave radiating elements, resulting in remarkably compact external dimensions (170 cm × 25 cm × 2 cm) and relatively low weight (8 kg in total).
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/276034 Collegamento a IRIS

2020 Modeling and electrochemical characterization of electrodes based on epoxy composite with functionalized nanocarbon fillers at high concentration
NANOMATERIALS
Autore/i: Cataldo, A.; Biagetti, G.; Mencarelli, D.; Micciulla, F.; Crippa, P.; Turchetti, C.; Pierantoni, L.; Bellucci, S.
Classificazione: 1 Contributo su Rivista
Abstract: This paper deals with the electrochemical characterization and the equivalent circuit modeling of screen-printed electrodes, modified by an epoxy composite and loaded with carbon nanotubes (CNTs), pristine and functionalized NH2, and graphene nanoplates (GNPs). The fabrication method is optimized in order to obtain a good dispersion even at high concentration, up to 10%, to increase the range of investigation. Due to the rising presence of filler on the surface, the cyclic voltammetric analysis shows an increasing of (i) electrochemical response and (ii) filler concentration as observed by the scanning electron microscopy (SEM). Epoxy/CNTs-NH2 and epoxy/GNPs, at 10% of concentration, show the best electrochemical behavior. Furthermore, epoxy/CNTs-NH2 show a lower percolation threshold than epoxy/CNT, probably due to the direct bond created by amino groups. Furthermore, the electrochemical impedance spectroscopy (EIS) is used to obtain an electrical equivalent circuit (EEC). The EEC model is a remarkable evolution of previous circuits present in the literature, by inserting an accurate description of the capacitive/inductive/resistive characteristics, thus leading to an enhanced knowledge of phenomena that occur during electrochemical processes.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/277741 Collegamento a IRIS

2020 Optomechanics of Chiral Dielectric Metasurfaces
ADVANCED OPTICAL MATERIALS
Autore/i: Zanotto, S.; Tredicucci, A.; Navarro-Urrios, D.; Cecchini, M.; Biasiol, G.; Mencarelli, D.; Pierantoni, L.; Pitanti, A.
Classificazione: 1 Contributo su Rivista
Abstract: The coupling between electromagnetic fields and mechanical motion in micro- and nanostructured materials has recently produced intriguing fundamental physics, such as the observation of mesoscopic optomechanical phenomena in objects operating in the quantum regime. It is also yielding innovative device applications, for instance in the manipulation of the optical response of photonic elements. Following this concept, here it is shown that combining a nanostructured chiral metasurface with a semiconductor suspended micromembrane can open new scenarios where the mechanical motion affects the polarization state of a light beam, and vice versa. Optical characterization of the fabricated samples, assisted by theory and numerical modeling, reveals that the interaction is mediated via moving-boundary and thermoelastic effects, triggered by intracavity photons. This work represents a first example of “Polarization Optomechanics,” which can give access to new forms of polarization nonlinearities and control. It can also lead to wide applications in fast polarimetric devices, polarization modulators, and dynamically tunable chiral state generators and detectors.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/276037 Collegamento a IRIS

2020 Efficient and versatile modeling of mono-and multi-layer MoS2 field effect transistor
ELECTRONICS
Autore/i: Pelagalli, N.; Laudadio, E.; Stipa, P.; Mencarelli, D.; Pierantoni, L.
Classificazione: 1 Contributo su Rivista
Abstract: Two-dimensional (2D) materials with intrinsic atomic-level thicknesses are strong candidates for the development of deeply scaled field-effect transistors (FETs) and novel device architectures. In particular, transition-metal dichalcogenides (TMDCs), of which molybdenum disulfide (MoS2) is the most widely studied, are especially attractive because of their non-zero bandgap, mechanical flexibility, and optical transparency. In this contribution, we present an efficient full-wave model of MoS2-FETs that is based on (1) defining the constitutive relations of the MoS2 active channel, and (2) simulating the 3D geometry. The former is achieved by using atomistic simulations of the material crystal structure, the latter is obtained by using the solver COMSOL Multiphysics. We show examples of FET simulations and compare, when possible, the theoretical results to the experimental from the literature. The comparison highlights a very good agreement.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/284800 Collegamento a IRIS

2020 Microwave applications of zirconium-doped hafnium oxide ferroelectrics: From nanoscale calculations up to experimental results
IEEE MTT-S International Microwave Symposium Digest
Autore/i: Aldrigo, M.; Dragoman, M.; Laudadio, E.; Iordanescu, S.; Modreanu, M.; Povey, I. M.; Nastase, F.; Vulpe, S.; Stipa, P.; Di Donato, A.; Pierantoni, L.; Mencarelli, D.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this paper, a systematic approach is reported for the electrical properties investigation of an emerging new class of materials for microwave applications, namely zirconium-doped hafnium oxide (HfZrO) ferroelectrics. Starting from atomistic simulations that take into account both structural and spectroscopic data to determine the interatomic potentials, the dielectric constant for the orthorhombic phase of HfZrO ferroelectrics has been extracted. By employing well-established microwave characterization techniques, the tunability of both effective permittivity and loss tangent of HfZrO for a low DC bias voltage of ±5 V has been verified experimentally. Finally, two microwave applications of thin-film (6-nm-thick) HfZrO-based ferroelectrics have been explored, namely an interdigitated capacitor-like phase shifter and a phased antenna array made of two patch elements working at 2.55 GHz, able to steer its beam of 25° for an applied bias of only ±1 V. These results demonstrate the potential impact that ferroelectric-based microwave circuits with tunable characteristics will have in the future telecommunications systems and, as well, the importance of a rigorous approach for their full chemical, physical and electromagnetic characterization.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/284943 Collegamento a IRIS

2020 A Compact and Robust Technique for the Modeling and Parameter Extraction of Carbon Nanotube Field Effect Transistors
ELECTRONICS
Autore/i: Falaschetti, Laura; Mencarelli, Davide; Pelagalli, Nicola; Crippa, Paolo; Biagetti, Giorgio; Turchetti, Claudio; Deligeorgis, George; Pierantoni, Luca
Classificazione: 1 Contributo su Rivista
Abstract: Carbon nanotubes field-effect transistors (CNTFETs) have been recently studied with great interest due to the intriguing properties of the material that, in turn, lead to remarkable properties of the charge transport of the device channel. Downstream of the full-wave simulations, the construction of equivalent device models becomes the basic step for the advanced design of high-performance CNTFET-based nanoelectronics circuits and systems. In this contribution, we introduce a strategy for deriving a compact model for a CNTFET that is based on the full-wave simulation of the 3D geometry by using the finite element method, followed by the derivation of a compact circuit model and extraction of equivalent parameters. We show examples of CNTFET simulations and extract from them the fitting parameters of the model. The aim is to achieve a fully functional description in Verilog-A language and create a model library for the SPICE-like simulator environment, in order to be used by IC designers.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/286033 Collegamento a IRIS

2020 Millimeter-Wave Meta Cells Loaded Coplanar Transmission Line for Component Applications
2020 14th International Congress on Artificial Materials for Novel Wave Phenomena, Metamaterials 2020
Autore/i: Joseph, C. H.; Mencarelli, D.; Pierantoni, L.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this work, a planar transmission line loaded with square shaped split ring resonator (SRR) metamaterials works around 150 GHz is modeled and validated by means of full-wave electromagnetic simulations. The transmission characteristics of such a transmission line is reported. The SRR loaded coplanar waveguide (CPW) structure exhibits stop band characteristics in response to the resonance of the inductively coupled SRR rings excited by the magnetic fluxes through the rings. A parametric analysis of the rings and arrays of SRRs carried out to predict the behavior of the meta cells loaded transmission line. Since these metamaterials are much smaller than the feeding signal wavelength, these metamaterials loaded transmission lines are potentially useful to optimize size and quality factor of millimeter-wave circuit components and radiating elements.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/287070 Collegamento a IRIS

2020 Dynamics of Optical Vortices in Speckle Patterns with Sub-Nanometric Spectral Resolution
Proceedings of 2020 Italian Conference on Optics and Photonics, ICOP 2020
Autore/i: Di Donato, A.; Mencarelli, D.; Criante, L.; Pierantoni, L.; Morini, A.; Farina, M.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: By exploiting a novel quantitative imaging technique based on Synthetic Optical Holography, we describe the dynamic behaviour of optical vortices in a speckle pattern generated by the interference of random scattered waves from the rough surface of a glass substrate. The system combines the advantages of digital holography and low-coherence interferometry to retrieve multiple holograms with sub-nanometric spectral resolution. The collection of multiple images of the complex scattered field allows to provide a statistical characterization of the phase singularities by changing the exciting wavelength.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/287389 Collegamento a IRIS

2020 Quantitative Phase Imaging of Embedded Scattering Surfaces by Synthetic Optical Holography
Proceedings Imaging and Applied Optics Congress
Autore/i: Di Donato, A.; Criante, L.; Mencarelli, D.; Pierantoni, L.; Morini, A.; Farina, M.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/287413 Collegamento a IRIS

2020 Coupling of Integrated Waveguide and Optomechanic Cavity for Microwave Phonon Excitation in Si Nanobeams
PHOTONICS
Autore/i: Gueddida, Abdellatif; Djafari Rouhani, Bahram; Pennec, Yan; Di Donato, Andrea; Pierantoni, Luca; Korovin, Alexander; Mencarelli, Davide
Classificazione: 1 Contributo su Rivista
Abstract: The availability of high quality manufacturing for optical micro/nano patterned cavities paves the way to the development of scalable circuits and devices based on optomechanical (OM) interaction of sound and light in extremely small volumes. In this contribution, we propose a new study on OM cavities that can lead to precise control of their coupling with closely integrated waveguides, a necessary condition to enhance mode excitation and wave energy trapping, opening the possibility for many potential applications in wave guiding, filtering, confinement, and sensing. Moreover, in this way the need for bulky experimental setups and/or optical fiber coupling/excitation is avoided. At the same time, quality factors of mechanical and optical modes resonating in the cavity are optimized, together with their OM coupling coefficients: high confinement of both excitations is a prerequisite to enable their acousto-optic (AO) interaction. To this aim, the transversal size of the cavity has been parabolically tapered, with the additional benefit of separating the cavity and the integrated waveguide far from the coupling region. The finite-element method has been used to perform full-wave analysis, and an accurate discussion about the simulation setup needed to properly describe optical scattering and radiation has been provided
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/287332 Collegamento a IRIS

2019 Blisters on graphite surface: a scanning microwave microscopy investigation
RSC ADVANCES
Autore/i: Pavoni, Eleonora; Yivlialin, Rossella; Christopher, Hardly Joseph; Fabi, Gianluca; Mencarelli, Davide; Pierantoni, Luca; Bussetti, Gianlorenzo; Farina, Marco
Classificazione: 1 Contributo su Rivista
Abstract: Scanning microwave microscopy (SMM) is based on the interaction between a sample and an electromagnetic evanescent field, in the microwave frequency range. SMM is usually coupled with a scanning probe microscopy (SPM) technique such as in our case, a scanning tunneling microscope (STM). In this way, the STM tip is used to control the distance between the probe and the sample while acting as an antenna for the microwave field. Thanks to the peculiarity of our home-made setup, the SMM is a suitable method to study blisters formed on HOPG surface as consequence of an electrochemical treatment. Our system has a “broad-band” approach that opens the way to perform local microwave spectroscopy over a broad frequency range. Moreover, microwaves have the ability to penetrate into the sample allowing the sub-surface characterization of materials. The application of the SMM to characterize blisters formed on the HOPG surface provides information on the sub-layer structures.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/269083 Collegamento a IRIS

2019 Borrowing from Microwave Holography a Technique for Broad-band Nano Imaging at Infrared Wavelengths
IEEE Proceedings of 2019 IEEE MTT-S International Microwave Symposium (IMS)
Autore/i: Di Donato, Andrea; Mencarelli, Davide; Pierantoni, Luca; Morini, Antonio; Farina, Marco
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Scanning Probe Microscopy (SPM) for Nano imaging includes different techniques, ranging from Atomic Force Microscopy (AFM) and Scanning Near-Field Optical Microscopy (able to acquire images beyond diffraction limit), up to Scanning Microwave Microscopy developed to achieve imaging and characterization of a sample at Microwaves. In the present work we describe a technique which implements the concept of "Synthetic Reference Wave", borrowed from Microwave Holography and already introduced in Synthetic Aperture Radars (SAR), to perform Nano scale quantitative imaging at infrared wavelengths. Although this approach was already combined in the past with AFM, in the following paper we proposed a different implementation, potentially suitable for wide-band imaging at Nano scale.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/270168 Collegamento a IRIS

2019 Efficient and versatile multiphysics/multiscale 3D model of fullerene single electron device
Proceedings of the IEEE Conference on Nanotechnology
Autore/i: Pierantoni, L.; Stocchi, M.; Silvestrini, M.; Ballicchia, M.; Mencarelli, D.; Dragoman, M.; Aldrigo, M.; Modreanu, M.
Editore: IEEE Computer Society
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Novel and disruptive nanoscale devices and sensors could be provided by the principle of storage and transport of single electrons, under direct control of external electrodes. The attractive features of these devices include operation at extremely low power, scalability to the sub-nanometer regime and extremely high charge sensitivity. In this work, we consider, as quantum-dot island, a fullerene sphere made of 100 carbon atoms (C1 symmetry group). In this preliminary study, we show details of the DFT calculation, with reference to the computational framework, i.e., master equations theory, used to address the problem
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/270655 Collegamento a IRIS

2019 Conversion between surface acoustic waves and guided modes of a quasi-periodic structured nanobeam
JOURNAL OF PHYSICS D. APPLIED PHYSICS
Autore/i: Korovin, A. V.; Pennec, Y.; Stocchi, M.; Mencarelli, D.; Pierantoni, L.; Makkonen, T.; Ahopelto, J.; Djafari Rouhani, B.
Classificazione: 1 Contributo su Rivista
Abstract: The generation of acoustic waves in structured nanobeams containing optomechanic cavities is a topic of current interest. In this paper, we theoretically study the efficient conversion of surface acoustic waves (SAW) generated on a substrate by an RF electric signal into the acoustic waves of a nanobeam. First, we demonstrate the possibility of converting the SAW generated on a silicon substrate with a thin piezoelectric AlN layer into the guided mechanical modes of a straight nanobeam with a maximum efficiency of  −22.6 dB. This can be achieved by using a set of inter-digitated transducers with radial fingers, which provide SAW focusing towards the nanobeam entrance. We analyse the nature of the modes created inside the nanobeam and the conversion efficiency of the SAW into the different modes. Then, we study the interaction of these waves with a one-dimensional phononic crystal nanobeam containing a cavity. The latter is constituted by an array of holes and stubs and has been proven in our recent works to be very efficient for optomechanic applications. We calculate the transmission properties of the cavity modes and discuss the efficiency of generating the cavity modes from the initial SAW.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/270634 Collegamento a IRIS

2019 Bridging the Gap between Electromagnetic and Quantum Transport: Developing a Multi-physics, Multi-scale Computational Platform
Proceeedings of the 13th European Conference on Antennas and Propagation, EuCAP 2019
Autore/i: Pierantoni, L; Mencarelli, D; Vecchi, G
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: This paper presents the development of a multi-scale, multi-physics computational platform necessary for the design of disruptive devices based on smart nano-structured materials technologies, for a wide area of applications, from microwave to photonics, in the field of interests of high-tech industries
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/270636 Collegamento a IRIS

2019 Mid-infrared optical characterization of thin SiNx membranes
APPLIED OPTICS
Autore/i: Stocchi, M.; Mencarelli, D.; Pierantoni, L.; Kot, D.; Lisker, M.; Goritz, A.; Kaynak, C. B.; Wietstruck, M.; Kaynak, M.
Classificazione: 1 Contributo su Rivista
Abstract: The investigation of the optical constants (e.g., the refractive index and the extinction coefficient ) has been performed in the mid-infrared spectrum for various silicon nitride (SiNx) configurations. By exploiting the transfer matrix method formulation, photometric measurements of transmission and reflection have been used for iteratively calculating the optical parameters of interest. To ensure the reliability of the and , the same material from which such parameters were extracted was deposited for three different thicknesses, e.g., 600, 200, and 100 nm. While the former is optically characterized, the remaining two are used for validation purposes. For each experimental/calculated comparison, the average (made over the whole considered spectrum interval) of the relative error never exceeds 1.5%, which ensures the correctness of the given and . For the sake of completeness, a detailed analysis of the intrinsic limitations arising from the very nature of the method will also be conducted
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/270635 Collegamento a IRIS

2019 Nano-scale electronics: Rigorous quantum study of a single molecule device
IEEE MTT-S International Microwave Symposium Digest
Autore/i: Mencarelli, D.; Pierantoni, L.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: A single molecule made of carbon atoms, namely C100, has been rigorously simulated for application in quantum electronics and related devices. A self-consistent calculation, using density functional theory and a master-slave perturbation approach, has been done in order to characterize the curren-voltage curves of the above nano-scale component, that could be the building block for future device concepts based on quantum transport. Charging effects, quantum tunneling, ballistic transport, are shown to characterize the device under study, making it an important element of a potential scalable platform for unconventional electronics with extremely high charge sensitivity
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/270637 Collegamento a IRIS

2019 Synthetic optical holography for in-depth imaging of optical vortices in speckle patterns
AIP ADVANCES
Autore/i: Di Donato, A.; Tamagnone, M.; Criante, L.; Cavanini, L.; Mencarelli, D.; Ippoliti, G.; Pierantoni, L.; Orlando, G.; Morini, A.; Farina, M.
Classificazione: 1 Contributo su Rivista
Abstract: In this paper, we report a novel approach based on a lensless Synthetic Optical Holography (SOH) that is aimed to recover the complex scattered field from buried surfaces at different wavelengths with sub-nanometric spectral resolution, without affecting the phase retrieval in depth. The proposed technique is applied to characterize and image the field scattered from a rough embedded surface of a microfluidic channel. The real and imaginary part of the random complex field revealed the presence of 2D optical vortices at each location in which a phase singularity is located. A statistical study of optical vortices is presented and the high spectral resolution is exploited to study the behavior of topological charges with the frequency shift.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/263134 Collegamento a IRIS

2019 Advanced numerical investigation of the heat flux in an array of microbolometers
SCIENTIFIC REPORTS
Autore/i: Stocchi, M.; Mencarelli, D.; Pierantoni, L.; Goritz, A.; Kaynak, C. B.; Wietstruck, M.; Kaynak, M.
Classificazione: 1 Contributo su Rivista
Abstract: The investigation of the thermal properties of an array of microbolometers has been carried out by mean of two independent numerical analysis, respectively the Direct-Simulation Monte Carlo (DSMC) and the classic diffusive approach of the Fourier’s equation. In particular, the thermal dissipation of a hot membrane placed in a low-pressure cavity has been studied for different values of the temperature of the hot body and for different values of the pressure of the environment. The results for the heat flux derived from the two approaches have then been compared and discussed
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/270633 Collegamento a IRIS

2018 Electromagnetic amplification of microwave phonons in nonlinear resonant microcavities
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Autore/i: Mencarelli, Davide; Stocchi, Matteo; Pierantoni, Luca
Classificazione: 1 Contributo su Rivista
Abstract: In this paper, we report on the numerical simulation of a multiphysic electromagnetic/mechanical problem, as a further step toward the development of microwave circuits based on phonon propagation at micro and nanoscale. In the future, this kind of circuits is likely to integrate optomechanically pumped phonon sources and detectors, as well as phonon processing components (waveguides, splitters, and memories) to process information by means of phonons. In particular, we propose a rigorous approach for the solution of the electromagnetic/mechanical system of equations governing light behavior in optomechanical cavities, with the help of the transformation optics method. Such a kind of calculation allows the development of an efficient generation of microwave coherent phonon sources, by engineering their propagation or coupling with phonon waveguides
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/259345 Collegamento a IRIS

2018 Ab-initio simulation of single carbon-cluster electron device
Proceedings of the 2018 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization, NEMO 2018
Autore/i: Pierantoni, L.; Socchi, M.; Mencarelli, D.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: A non-symmetrical C100 Fullerene molecule enclosed by three electrodes (source, drain, gate) made of gold has been chosen as the test configuration for single electron device (SET). Quantum transport of single electrons, under direct control of external electrodes has been rigorously simulated by density functional theory (DFT). The importance and the potential of the above device include operation at low power, and uniquely high charge sensitivity due to Coulomb blockade, possibly observable up to the room temperature
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/270654 Collegamento a IRIS

2018 Transformation Optics: Large Multiphysics Simulation of Nonlinear Optomechanical Coupling in Microstructured Resonant Cavities
IEEE MICROWAVE MAGAZINE
Autore/i: Stocchi, Matteo; Mencarelli, Davide; Pierantoni, Luca
Classificazione: 1 Contributo su Rivista
Abstract: The interfacing between optical cavities and mechanical systems has given rise to the rapid development of cavity optomechanics, which aims to confine light into small volumes by means of high-Q resonant recirculation [1], [2]. The purpose of an optomechanical system is to investigate the interaction of light with a mechanical oscillator. Its highly interdisciplinary nature leads to several potential applications in various fields of research, especially in quantum processing
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/258749 Collegamento a IRIS

2018 First order iterative learning control for a single axis piezostage system
2018 5th International Conference on Control, Decision and Information Technologies, CoDIT 2018
Autore/i: Cavanini, Luca; Corradini, Maria Letizia; Di Donato, Andrea; Farina, Marco; Hoffhues, Lennart; Ippoliti, Gianluca; Mencarelli, Davide; Orlando, Giuseppe; Pierantoni, Luca; Wieghaus, Markus F.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/265939 Collegamento a IRIS

2018 Rigorous Model of Nonlinear Optomechanical Coupling in Micro- and Nano-Structured Resonant Cavities
IEEE MTT-S International Microwave Symposium Digest
Autore/i: Mencarelli, D.; Stocchi, M.; Pierantoni, L.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: We introduce an accurate analytical and numerical method aimed to predict the optomechanical dynamics in micro- and nano-structured resonant cavities by exploiting the harmonic version of the Transformation Optics (TO) technique. In respect to the standard optomechanical perturbative theory, our full-wave approach implements a multimodal analysis and also considers material losses, from both a mechanical and an optical point of view. The rigorousness of the theoretical aspect of the model is ensured by considering all the energy-transduction contributions of electrostriction, radiation pressure, photoelasticity and moving boundaries. The efficiency of the strategy is tested by analyzing the optomechanical behavior of a corrugated Si-based nanobeam and comparing numerical results to experimental ones from the literature, showing a good agreement, thus confirming versatility and efficiency
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/270656 Collegamento a IRIS

2018 The Electromagnetic framework of "Nanoarchitectronics"
Proceedings of the 2018 IEEE Antennas and Propagation Society International Symposium and USNC/URSI National Radio Science Meeting, APSURSI 2018
Autore/i: Ahopelto, J; Benini, A; Bilotti, F; Casali, B; Chazelas, J; Gerini, G; Hao, Y; Herbertz, K; Maci, S; Massa, A; Pierantoni, L; Torres, Cms; Tretyakov, S; Tripon-Canseliet, C; Vardaxoglou, Y; Vecchi, G; Zayats, A
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: 'Nanoarchitectronics' (NTX) denotes a new interdisciplinary research area at the crossroad of Electromagnetics and Nanoelectronics. This new technology will develope reconfigurable, adaptive and cognitive structures with unique physical properties, and engineering applications in the whole electromagnetic spectrum. This FET project funded by the European Framework of Research 'Horizon 2020', gathers thirteen universities, research centers and high-tech industries, belonging to eight European countries, combining concepts of multidisciplinary systems in a huge frequency range
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/270639 Collegamento a IRIS

2018 Rigorous simulation of nonlinear optomechanical coupling in micro- and nano-structured resonant cavities
INTERNATIONAL JOURNAL OF OPTOMECHATRONICS
Autore/i: Stocchi, Matteo; Mencarelli, Davide; Pennec, Yan; Djafari-Rouhani, Bahram; Pierantoni, Luca
Classificazione: 1 Contributo su Rivista
Abstract: A numerical method aimed to predict the optomechanical dynamics in micro- and nano-structured resonant cavities is introduced here. The rigorousness of it is ensured by exploiting the harmonic version of the transformation optics (TO) technique and by considering all the energytransduction contributions of electrostriction, radiation pressure, photoelasticity and moving boundaries. Since our full-wave approach implements a multi-modal analysis and also considers material losses, from both a mechanical and an optical point of view, a considerable step further has been made in respect to the standard optomechanical perturbative theory. The efficiency and the versatility of the strategy are tested by analysing the optomechanical behaviour of a corrugated Si-based nanobeam and comparing numerical results to experimental ones from the literature
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/258763 Collegamento a IRIS

2018 Numerical emulation of Thru-Reflection-Line calibration for the de-embedding of Surface Acoustic Wave devices
SCIENTIFIC REPORTS
Autore/i: Mencarelli, D.; Djafari-Rouhani, B.; Pennec, Y.; Pitanti, A.; Zanotto, S.; Stocchi, M.; Pierantoni, L.
Classificazione: 1 Contributo su Rivista
Abstract: In this contribution, a rigorous numerical calibration is proposed to characterize the excitation of propagating mechanical waves by interdigitated transducers (IDTs). The transition from IDT terminals to phonon waveguides is modeled by means of a general circuit representation that makes use of Scattering Matrix (SM) formalism. In particular, the three-step calibration approach called the Thru- Reflection-Line (TRL), that is a well-established technique in microwave engineering, has been successfully applied to emulate typical experimental conditions. The proposed procedure is suitable for the synthesis/optimization of surface-acoustic-wave (SAW) based devices: the TRL calibration allows to extract/de-embed the acoustic component, namely resonator or filter, from the outer IDT structure, regardless of complexity and size of the letter. We report, as a result, the hybrid scattering parameters of the IDT transition to a mechanical waveguide formed by a phononic crystal patterned on a piezoelectric AlN membrane, where the effect of a discontinuity from periodic to uniform mechanical waveguide is also characterized. In addition, to ensure the correctness of our numerical calculations, the proposed method has been validated by independent calculations
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/258985 Collegamento a IRIS

2017 A multi-physics approach for the analysis and design of optomechanical cavities
Proceedins of the IEEE MTT-S Int. Micr. Workshop Series on Advan. Mat. And Proc. (IMWS-AMP 2017)
Autore/i: Mencarelli, D.; Stocchi, M.; Pierantoni, L.
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this contribution, we report on numerical simulation of a multi-physic Electromagnetic/Mechanical problem, as a further step towards the development of GHz circuits based on phonon propagation at micro-and nano-scale. In the future, this kind of circuits is likely to integrate opto-mechanically pumped phonon sources and detectors, as well as phonon processing components (waveguides, splitters, memories) to process information by means of phonons. In particular, we propose a rigorous approach for the solution of the electromagnetic/mechanical system of equations governing light behavior in opto-mechanical cavities, with the help of the Transformation Optics (TO) method. Such kind of calculation allows the development of an efficient generation of GHz to tens of GHz coherent phonon sources, by engineering their propagation or coupling with phonon waveguides
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255588 Collegamento a IRIS

2017 Accurate analysis of plasmon propagation in metal and graphene nanostructures
Proceedings of the IEEE MTT-S Int. Micr. Workshop Series on Advan. Mat. And Proc. (IMWS-AMP 2017)
Autore/i: Pierantoni, Luca; Mencarelli, Davide; Stocchi, Matteo
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: We introduce an accurate analytical and numerical characterization of plasmonic propagation in meso- and nanoheterostructure for noble metal- and graphene-based device configurations. The method developes into three steps, i) the Kretschmann configuration technique, ii) the transfer matrices approach and iii) a full-wave multi-scale numerical simulation. The method is first tested by comparing theoretical results to experimental ones from the literature, and then applied to investigate plasmon propagation in graphene-based devices. The final aim is the full-wave design of plasmonic components/devices ranging from the THz to the optical range, involving both noble metals and energing 2D-materials, e.g. graphene
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255593 Collegamento a IRIS

2017 THz plasmonic resonances in hybrid reduced-graphene-oxide and graphene patterns for sensing applications
OPTICAL DATA PROCESSING AND STORAGE
Autore/i: Mencarelli, Davide; Nishina, Yuta; Ishikawa, Atsushi; Pierantoni, Luca; Bellucci, Stefano
Classificazione: 1 Contributo su Rivista
Abstract: In this contribution, we eectively combine important developments of nowadays technology: graphene based THz plasmonics, reduced-graphene-oxide (rGO) based sensors, and capability of patterning graphene materials at micro and nano scale. Surface waves in graphene were observed for the rst time only few years ago, conrming the ability of this exceptional material to support plasmons at relatively low frequencies - a few THz - due to its intrinsically huge selfinductance. On the other hand, graphene oxide, and its reduced forms, has emerged as a very interesting material for several applications, including gas sensors and biosensors. In this work, the possibility of a ne and controlled patterning of the above materials is considered as a useful degree of freedom to govern plasmon resonances and consequent electromagnetic absorption. In particular, the excitation of THz plasmons in arrays of nanoribbons, made of graphene and rGO, has been deeply investigated, in order to quantify the sensitivity to surface changes of conductivity, due to possible external perturbations. Fullwave analysis of hybrid metal-graphene-rGO is also presented and discussed. The eects of substrate thickness and of higher diraction modes are rigorously taken into account, as a possible mean to enhance the sensing capability of the proposed device.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255628 Collegamento a IRIS

2017 Developments of microwave microscopy for application to biological samples
International Conference on Manipulation, Automation and Robotics at Small Scales, MARSS 2017 - Proceedings
Autore/i: Farina, M.; Mencarelli, D.; Morini, A.; Pierantoni, L.; Jin, X.; Hwang, J.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255317 Collegamento a IRIS

2017 Synthetic holography at infrared wavelength for nanostructure imaging: Scanning microscopy based on extrinsic microcavity
Proceedings of the IEEE MTT-S Int. Micr. Workshop Series on Advan. Mat. And Proc. (IMWS-AMP 2017)
Autore/i: Di Donato, A.; Farina, M.; Stocchi, M.; Mencarelli, D.; Pierantoni, L.
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Synthetic optical holography (SOH) is a recent technique introduced in scanning microscopy to record amplitude and phase of a scattered field from a sample at nanoscale. In this work, we describe a compact implementation realized in optical fiber and working at infrared wavelength. The system is based on a scanning extrinsic optical microcavity and combines the low-coherence properties of the infrared laser source with the resonant behavior of a micro-cavity, in order to realize a high sensitive imaging system. Measurements were performed over a nanometric SiO2 grating, achieving a lateral resolution of about 1 pm by means of an optical fiber with a Numerical Aperture (NA) equal to 0.1 and a Mode Field Diameter (MDF) of 5.6 pm
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255586 Collegamento a IRIS

2017 Rigorous simulation of opto-mechanically modulated electromagnetic micro- and nano-cavities
2017 IEEE 17th International Conference on Nanotechnology, NANO 2017
Autore/i: Mencarelli, D.; Stocchi, M.; Pierantoni, L.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: We report on numerical analysis of opto-mechanical (OM) cavities, with a full description of the rigorous numerical scheme involved, with emphasis on the mechanical stress induced by EM fields. In the future, OM structures are likely to be integrated in planar technology as pumped phonon sources and detectors, as well as phonon processing components (waveguides, splitters, memories) to process information by means of phonons. The solution of the equations governing the light behavior in opto-mechanical cavities is formally addressed by the Transformation Optics (TO) method. Such kind of calculation will help to engineer the coupling and the synchronization of GHz to tens of GHz coherent phonon sources.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255570 Collegamento a IRIS

2017 Accurate analysis of plasmon propagation in metal and graphene nanostructures
IEEE MTT-S International Microwave Symposium Digest
Autore/i: Pierantoni, Luca; Mencarelli, Davide; Stocchi, Matteo
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255576 Collegamento a IRIS

2017 Electro-thermal and quantum analysis of CNT-based interconnections
Proceeding of the 2017 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization for RF, Microwave, and Terahertz Applications (IEEE NEMO 2017)
Autore/i: Mencarelli, D.; Stocchi, M.; Pierantoni, L.
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Due to the rapid increases in current densities, wires, planar conductors and ground lines, become more and more vulnerable to electromigration. Future RF advanced packaging applications require new materials endowed of low electrical resistance, high reliability, chip-to-package interconnects, and improved thermal management. In this contribution, we introduce a multi-physics full-wave investigation of a CNT based interconnection bridging microstrips placed on different planar surface. The model include coupled i) electromagnetic, ii) quantum and iii) thermal analysis
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255572 Collegamento a IRIS

2017 Eigenvalues approach for the analysis of plasmon propagation on a graphene layer
Proceedings of the 20th European Microwave Week (EuMW 2017)
Autore/i: Pierantoni, L.; Mencarelli, D.; Stocchi, M.; Rozzi, T.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Starting from Dirac equation for an idealized graphene layer together with the Lorentz gauge condition, we describe plasmon propagation without making recourse to a classical Kubo-Drude electron model. Two excitation modes are separately considered : 1) excitation by a TM-polarized wave of given vector potential amplitude (voltage source), 2) excitation by current injection (e.g. via a probe)(current source). Losses are accounted for globally by means of a lifetime term. A simple LCR model of the surface admittance emerges that is valid up to several THz and beyond, even under impulsive time-excitation
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255592 Collegamento a IRIS

2017 Scanning Probe Microscopy at Microwave and Near Infrared Wavelengths for Biology Applications
PIERS Progress In Electromagnetics Research Symposium, Nanobiosensors for Bio-diagnostics, Environmental Monitoring and Food Safety
Autore/i: DI DONATO, Andrea; Mencarelli, Davide; Pierantoni, Luca; Stocchi, M.; Farina, M.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/258582 Collegamento a IRIS

2017 Evaluating CNT-Based Interconnects : A Numerical Tool to Characterize Hybrid CNT-Copper Interconnects
IEEE MICROWAVE MAGAZINE
Autore/i: S. Bistarelli, S. Sun, D. Mencarelli, L. Pierantoni, S. Bellucci, J. Liu,
Classificazione: 1 Contributo su Rivista
Abstract: Nanotechnologies offer a vast number of applications due to the unique features of nanostructured materials [1]. In the electronics field, this new technology could open innovative ways to go beyond Moore's law [2], but progress in manufacturing technology still limits the wide dispersion of nanotechnology-based circuits. The bridge between nanoscience and realized devices can be achieved by modeling the multiphysics phenomena at the nanoscale, which will aid in the development of the technology
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/248294 Collegamento a IRIS

2017 Low-dimensional materials for optically-assisted microwave applications
Proceedings of SPIE - The International Society for Optical Engineering
Autore/i: Tripon-Canseliet, C.; Liu, Z.; Pierantoni, L.; Combrié, S.; De Rossi, A.; Maci, S.; Chazelas, J.
Editore: SPIE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: From latest nanotechnology advances, low-dimensional matter confinement delivered by nanostructuration or few-layer stacking offer new opportunities for ultimate light absorption performances. In this field, semiconducting 2D materials and photonic crystals have already demonstrated promising flexible optical properties from monoatomic to bulk structuration covering visible to IR spectral range. Today, these emerging materials such as Phosphorene, allow reconsideration of some physical effects such as photoconductivity. Indeed, its exploitation in integrated planar structures become c in terms of efficient local contactless control with a high degree of tunability by optics in association with high dark resistivity, fast carrier dynamics, and sub-wavelength light coupling solutions compatibility. Multiscale modeling and design tools implementing material anisotropic parameters from atomic configuration up to mesoscale, in complement with multiscale optical characterization in a large frequency bandwidth opens routes to new microwave signal processing functionalities such as switching, generation, amplification and emission over a large frequency bandwidth, that could not be achieved by full electronic solutions. This paper will report on latest demonstrations of high performance photoconductive structures for high frequency applications and review state-of-the-art research work in this area, with a specific focus on latest demonstrations for airborne applications
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255635 Collegamento a IRIS

2017 Nano Probing for Microwave ngineers: Calculating Probe-Sample Capacitance and Charge Distribution of a Near-Field Scanning Microwave Microscope on a Nanoscale
IEEE MICROWAVE MAGAZINE
Autore/i: Jin, Xin; Hwang, James C.M.; Mencarelli, Davide; Pierantoni, Luca; Farina, Marco
Classificazione: 1 Contributo su Rivista
Abstract: The app described in this article was presented at the student design competition of the 2016 I Microwave Theory and Techniques Society (MTT-S) International Microwave Symposium. As sponsored by Technical Committee MTT-25 on F nanotechnology, the competition's objective was to develop user-friendly interfaces to facilitate the design and application of F nanotechnology. To this end, the app is capable of simulating the capacitance and charge distribution of the probe-sample interaction on a nanoscale in near-field scanning microscopes, such as the scanning microwave microscope (SMM), the atomic force microscope (AFM), and the scanning tunneling microscope (STM).
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/246079 Collegamento a IRIS

2016 Multiphysic modelling of plasmon excitation and spatialdispersion in graphene devices
10th European Conference on Antennas and Propagation
Autore/i: MENCARELLI, Davide; PIERANTONI, Luca
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/63782 Collegamento a IRIS

2016 Learning by Using Graphene Multilayers: An Educational App for Analyzing the Electromagnetic Absorption of a Graphene Multilayer Based on a Network Model
IEEE MICROWAVE MAGAZINE
Autore/i: M. Baldelli; L. Pierantoni; S. Bellucci
Classificazione: 1 Contributo su Rivista
Abstract: The app relates to the electromagnetic absorption capability of a multilayer composite material based on graphene. This is a topic of great interest. Considerable research has demonstrated the potential of graphene in realizing thin but nevertheless effective electromagnetic shields for electromagnetic interference (EMI), radar, or aerospace applications
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/235651 Collegamento a IRIS

2016 Rigorous simulation of ballistic graphene-based transistor
IEEE MTT-S International Microwave Symposium Digest
Autore/i: Mencarelli, D.; Pierantoni, L.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Graphene transistors are currently the object of deep investigation, both in theoretical and experimental directions. In this contribution, we show self-consistent analysis of graphene based FETs, in a ballistic framework, in order to provide a rigorous tool to improve knowledge of the device behavior down to the nanoscale. Still, many points remain open, and there is a high demand for numerical tools able to capture all the features of the above ballistic device. Here, the analysis is performed by Dirac description of graphene wavefunctions, which holds for slowly-varying potential-perturbations. Charge-potential self-consistency is ensured by iteration of transport and Poisson equations
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/239044 Collegamento a IRIS

2016 Vertically aligned CNT-Cu nano-composite material for stacked through-silicon-via interconnects
NANOTECHNOLOGY
Autore/i: Sun, Shuangxi; Mu, Wei; Edwards, Michael; Mencarelli, Davide; Pierantoni, Luca; Fu, Yifeng; Jeppson, Kjell; Liu, Johan
Classificazione: 1 Contributo su Rivista
Abstract: For future miniaturization of electronic systems using 3D chip stacking, new fine-pitch materials for through-silicon-via (TSV) applications are likely required. In this paper, we propose a novel carbon nanotube (CNT)/copper nanocomposite material consisting of high aspect ratio, vertically aligned CNT bundles coated with copper. These bundles, consisting of hundreds of tiny CNTs, were uniformly coated by copper through electroplating, and aspect ratios as high as 300:1 were obtained. The resistivity of this nanomaterial was found to be as low as ∼10−8 Ωm, which is of the same order of magnitude as the resistivity of copper, and its temperature coefficient was found to be only half of that of pure copper. The main advantage of the composite TSV nanomaterial is that its coefficient of thermal expansion (CTE) is similar to that of silicon, a key reliability factor. A finite element model was set up to demonstrate the reliability of this composite material and thermal cycle simulations predicted very promising results. In conclusion, this composite nanomaterial appears to be a very promising material for future 3D TSV applications offering both a low resistivity and a low CTE similar to that of silicon.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/239042 Collegamento a IRIS

2016 Efficient and versatile graphene-based multilayers for em field absorption
APPLIED PHYSICS LETTERS
Autore/i: Mencarelli, D.; Pierantoni, L.; Stocchi, M.; Bellucci, S.
Classificazione: 1 Contributo su Rivista
Abstract: We thoroughly investigate the possibility to absorb most (i.e., up to more than 90%) of the incident electro-magnetic radiations in thin multilayered PMMA/graphene structures, thus proposing the technical realization of a device with an operational frequency range in the millimeter-wave domain, i.e., 30GHz–300GHz. Our simulations demonstrate the concrete possibility to enhance the field absorption by means of a selective removal and proper micro-pattering within the graphene material, enabling a complete and efficient control of the graphene sheet conductance. This method is applied to design and engineer a class of devices, endowed with a wideband operation capability, showing almost no fluctuations throughout the whole range of mm-wave frequencies.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/239041 Collegamento a IRIS

2016 Plasmon modes in extrinsic graphene: Ab initio simulations vs semi-classical models
NATO Science for Peace and Security Series B: Physics and Biophysics
Autore/i: Sindona, Antonello; Pisarra, Michele; Mencarelli, Davide; Pierantoni, Luca; Bellucci, Stefano
Editore: Springer Verlag
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Excitation and propagation of surface plasmons in intrinsic and extrinsic graphene are analyzed from the fundamental point of view, using time-dependent density functional theory in linear response regime. Density functional calculations, being set up from first principles, do include anisotropic effects in the unique electronic structure of graphene that cause remarkable consequences even on the THz band. The main signature of this anisotropy is the occurrence of two distinct plasmon modes over a frequency range of 1 to 300THz, where most photonic devices currently operate with large bandwidths and low losses. Further anisotropic features are inherent to the different electromagnetic response of graphene to positive and negative doping concentrations. The Dirac-cone approximation provides a simplified insight, assuming an isotropic graphene band structure near the Fermi level, which is found to be reliable at probing frequencies below ~20 THz and doping levels associated to Fermi energy shifts below/above ±0.3 eV. In these limits, a continuous integral expression derived from the Kubo formula represents an easy-to-use tool capable of catching the main essence of the process.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/239073 Collegamento a IRIS

2016 Ballistic Ratchet effect on patterned graphene
INTEGRATED FERROELECTRICS
Autore/i: Bellucci, S; Pierantoni, L.; Mencarelli, D.
Classificazione: 1 Contributo su Rivista
Abstract: Charge scattering from spatially asymmetric antidots patterned on graphene has been investigated, in the ballistic scale. The Scattering Matrix (SM) approach, formally equivalent to the Non Equilibrium Green's Function method, but particularly suitable for large structures, has been applied in order to evaluate the electron/hole distribution in patterned graphene upon injection of charge from metal contacts. The mathematical formulation of the SM method has been reviewed and commented. The presented work can be the basis for a systematic study of the Ratchet effect in the above kind of structure. A completely deterministic characterization of this effect is proposed, based on the scattering of asymmetric defects under external electromagnetic excitation. The Ratchet effect could be usefully exploited to realize high frequency detectors, sensors, and harvesting devices
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/246080 Collegamento a IRIS

2015 Electrical conductivity of graphene: A time-dependent density functional theory study
Proceedings of the International Semiconductor Conference, CAS
Autore/i: Bellucci, S.; Sindona, A.; Mencarelli, Davide; Pierantoni, Luca
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Excitation and propagation of surfaces waves in graphene are analyzed within a frequency band of 1 to 300 THz, and a time domain of 1 to 10 ps. An ab initio approach, based on time dependent density functional theory in linear response regime is used. The key outputs of the simulation are the ab-initio conductance in time and frequency. This is shown to tend to a continuous integral relations in graphene, when the valence and conduction bands is treated within the conical approximation, in agreement with a widely used construction derived from the Kubo formula. Non-negligible differences are observed between the ab-initio and continuous methods at frequencies larger than a few tens of THz, i.e., at times shorter that 0.1ps, where the conical approximation reaches its limits of validity. The main conclusion of the study is that a novel conductivity concept is introduced, which represents a fundamental improvement with respect to some commonly used methods in electromagnetic simulations, working at THz frequencies. These tools may open the way to properly analyze graphene related materials, hethero-structures and interfaces.).
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/234302 Collegamento a IRIS

2015 Spatial dispersion effects upon local excitation of extrinsic plasmons in a graphene micro-disk
JOURNAL OF PHYSICS D. APPLIED PHYSICS
Autore/i: D. Mencarelli; S. Bellucci; A. Sindona; L. Pierantoni
Classificazione: 1 Contributo su Rivista
Abstract: Excitation of surface plasmon waves in extrinsic graphene is studied using a full-wave electromagnetic field solver as analysis engine. Particular emphasis is placed on the role played by spatial dispersion due to the finite size of the two-dimensional material at the micro-scale. A simple instructive set up is considered where the near field of a wire antenna is held at sub-micrometric distance from a disk-shaped graphene patch. The key-input of the simulation is the graphene conductivity tensor at terahertz frequencies, being modeled by the Boltzmann transport equation for the valence and conduction electrons at the Dirac points (where a linear wave-vector dependence of the band energies is assumed). The conductivity equation is worked out in different levels of approximations, based on the relaxation time ansatz with an additional constraint for particle number conservation. Both drift and diffusion currents are shown to significantly contribute to the spatially dispersive anisotropic features of micro-scale graphene. More generally, spatial dispersion effects are predicted to influence not only plasmon propagation free of external sources, but also typical scanning probe microscopy configurations. The paper sets the focus on plasmon excitation phenomena induced by near field probes, being a central issue for the design of optical devices and photonic circuits.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/234304 Collegamento a IRIS

2015 Innovative full wave modeling of plasmon propagation in graphene by dielectric permittivity simulations based on density functional theory
2015 IEEE MTT-S International Microwave Symposium, IMS 2015
Autore/i: Pierantoni, L.; Mencarelli, D.; Sindona, A.; Gravina, M.; Pisarra, M.; Gomez, C. Vacacela; Bellucci, S.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: We report on an ab initio technique for modeling the electromagnetic response of graphene in the THz range. Quantum mechanical calculations are performed using linear response density functional theory, and compared with a semiphenomenological model derived from the Kubo formula. We present a novel concept of dispersive conductivity, which goes beyond the Kubo-Drude model and results in a self-consistent constitutive relation for the analysis of plasmon propagation in complex nanosystems. The rigorous characterization of the constitutive relation may be inserted in electromagnetic fullwave solvers, providing a new paradigm for nanoelectronic computations at THz frequencies.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/234308 Collegamento a IRIS

2015 Application and modelling of ballistic carbon nanodevices
27th Indian Summer school of physics, “Graphene the bridge between low- and high energy physics"
Autore/i: Mencarelli, D.; Pierantoni, L.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/235656 Collegamento a IRIS

2015 Broadband Microwave Attenuator Based on Few Layer Graphene Flakes
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Autore/i: PIERANTONI, Luca; MENCARELLI, Davide; Bozzi, Maurizio; Moro, Riccardo; Moscato, Stefano; Perregrini, Luca; Micciulla, Federico; Cataldo, Antonino; Bellucci, Stefano
Classificazione: 1 Contributo su Rivista
Abstract: This paper presents the design and fabrication of a broadband microstrip attenuator, operating at 1-20 GHz, based on few layer graphene flakes. The RF performance of the attenuator has been analyzed in depth. In particular, the use of graphene as a variable resistor is discussed and experimentally characterized at microwave frequencies. The structure of the graphene-based attenuator integrates a micrometric layer of graphene flakes deposited on an air gap in a microstrip line. As highlighted in the experiments, the graphene film can range from being a discrete conductor to a highly resistive material, depending on the externally applied voltage. As experimental evidence, it is verified that the application of a proper voltage through two bias tees changes the surface resistivity of graphene, and induces a significant change of insertion loss of the microstrip attenuator.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/234306 Collegamento a IRIS

2015 Time-Domain Multiphysics Modeling of the Electromagnetic-Transport Problem in Nanomaterials/Devices: a New Challenge in Computational Engineering
Proceedings of the 16th Intern. Conference on Nanoscience & Nanotechnology 2015
Autore/i: L. Pierantoni
Luogo di pubblicazione: Frascati (Roma)
Classificazione: 5 Altro
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/234925 Collegamento a IRIS

2015 Ballistic simulation of Ratchet effect in antidotlattices patterned on graphene
Proceedings of the 18th European Microwave Week (EuMW)
Autore/i: L. Pierantoni; D. Mencarelli; F. Coccetti; T. Rozzi
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this contribution, we investigate the mechanism governing the Ratchet effect in patterned monolayer graphene, at the ballistic nanoscale. Still smaller than currently achievable and manifacturable devices, the simulated structures serve to exemplify the dependence of charge scattering on the arrangement of lattice defects, i.e. clusters of atomic vacancies of triangular shape. The ballistic Ratchet effect is seen as cumulative multimode scattering of carriers in correspondence of the lattice discontinuities. An atomistic model, based on the Scattering Matrix method and making use of TB approximation, has been applied. The latter, in contrast with continuum models, like Dirac or Kubo-Drude derived formulas, is capable of describing abrupt discontinuities at sub-micrometric scales, where graphene is likely to preserve its outstanding properties. We believe that this work is a first step in the direction of engineering and design of devices based on the ballistic Ratchet effect, like RF and THz detectors.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/234924 Collegamento a IRIS

2015 Full-wave techniques for the multi-physics modeling and design of nano-structured devices
Proceedings of the NATO Advanced Research Workshop on Fundamental and Applied NanoElectroMagnetics”, FANEM 2015
Autore/i: L. Pierantoni; D. Mencarelli
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Full-wave multiphysics techniques aimed at the investigation of the combined electromagnetic-coherent transport phenomena in carbonbased nano-structures/devices are presented. Advanced numerical tools, in the frequency (energy)-domain and timedomain and in multi-scale environment are derived. The quantum transport is modeled by i) discrete Hamiltonians at atomistic scale, ii) Schrödinger equation, and/or Dirac/Dirac-like eqs. at continuous level. In the frequency-domain, a rigorous Poisson-coherent transport equation system is provided
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/234920 Collegamento a IRIS

2015 Back-gate bias of a graphene antenna via a smart background metallization
Proceedings of the International Semiconductor Conference, CAS
Autore/i: Aldrigo, M.; Dragoman, M.; Pierantoni, L.; Mencarelli, D.; Deligeorgis, G.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this paper we present a new way of biasing the graphene radiator of a coplanar patch antenna by exploiting an ad–hoc designed backside metallization. Due to the intrinsic physical properties of graphene, this would represent the most effective way to tune antenna matching and radiation characteristics by tuning graphene surface impedance. Simulation results are provided, showing that the proposed background metal plane does not affect antenna performance, thus guaranteeing an effective back–gate biasing technique
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/234303 Collegamento a IRIS

2015 Comparison of rigorous vs approximate methods for accurate calculation of 2D-materials band structures and applications to THz nanoelectronics
2015 IEEE MTT-S International Microwave Symposium, IMS 2015
Autore/i: Pierantoni, L.; Mencarelli, D.; Sindona, A.; Bellucci, S.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: We report on ab initio and semi-empirical techniques to investigate the electromagnetic response of 2D materials with honeycomb lattice. Band structure simulations, using density functional theory, are performed on pristine graphene and silicene. The predictions on the unique electronic features of these systems are compared to those obtained with some commonly used approaches, based on the tight-binding approximation and k.p perturbation theory. The analysis is extended to computing the surface conductivity of graphene. Our results confirm the good agreement between fundamental and approximated methods up to THz frequencies. At the same time, they show how the ab initio methods have the capability of predicting electronic properties and plasmon propagation in more realistic nano-devices, where the semi-empirical methods require further scrutiny. The above formulation will be inserted in electromagnetic full-wave solvers, for the investigation and design of 2D THz nanodevices.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/234307 Collegamento a IRIS

2015 Electromagnetic characterization of graphene and graphene nanoribbons via ab-initio permittivity simulations
Proceedings of the 2015 International Conference on Electromagnetics in Advanced Applications, ICEAA 2015
Autore/i: Bellucci, S.; Sindona, A.; Mencarelli, D.; Pierantoni, L.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Excitation and propagation of surfaces waves in graphene and graphene nanoribbons are analyzed, within a frequency band of 1 to 300 THz, based on time dependent density functional theory, in linear response regime. The key outputs of the simulation is the ab-initio complex impeance of the materials. This is shown to tend to a continuous integral relations in graphene, when the valence and conduction bands is treated within the conical approximation, in agreement with a widely used construction derived from the Kubo formula. Non negligible differences are observed between the ab-initio and continuous methods at frequencies larger than a few tens of THz, where the conical approximation reaches its limits of validity. The main conclusion of the study is that a novel conductivity concept is introduced, which represents a fundamental improvement with respect to some commonly used methods in electromagnetic simulations, working at THz frequencies. These tools may open the way to properly analyze graphene related materials, hethero-structures and interfaces.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/234305 Collegamento a IRIS

2015 Electrical conductivity of graphene: a time dependent density functional theory study
Proceedings of the NATO Advanced Research Workshop on Fundamental and Applied NanoElectroMagnetics”, FANEM 2015
Autore/i: S., Bellucci; A., Sindona; Mencarelli, Davide; Pierantoni, Luca
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: We present a full quantum characterization of the plasmon-induced conductivity in freestanding graphene, both in the frequency and time domains, using time dependent (TD) DFT at the level of linear response (LR) theory, and under the random phase approximation [5].
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/234921 Collegamento a IRIS

2015 A tunable microwave slot antenna based on graphene
APPLIED PHYSICS LETTERS
Autore/i: Dragoman, Mircea; Neculoiu, Dan; Bunea, Alina-Cristina; Deligeorgis, George; Aldrigo, Martino; Vasilache, D.; Dinescu, A.; Konstantinidis, George; Mencarelli, Davide; Pierantoni, Luca; Modreanu, M.
Classificazione: 1 Contributo su Rivista
Abstract: The paper presents the experimental and modeling results of a microwave slot antenna in a coplanar configuration based on graphene. The antennas are fabricated on a 4 in. high-resistivity Si wafer, with a ∼300 nm SiO2 layer grown through thermal oxidation. A CVD grown graphene layer is transferred on the SiO2. The paper shows that the reflection parameter of the antenna can be tuned by a DC voltage. 2D radiation patterns at various frequencies in the X band (8-12 GHz) are then presented using as antenna backside a microwave absorbent and a metalized surface. Although the radiation efficiency is lower than a metallic antenna, the graphene antenna is a wideband antenna while the metal antennas with the same geometry and working at the same frequencies are narrowband. © 2015 AIP Publishing LLC
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/225878 Collegamento a IRIS

2015 Microwave characterization of anisotropic graphene by applying the Duality theorem
JOURNAL OF COMPUTATIONAL ELECTRONICS
Autore/i: Mencarelli, D.; Pierantoni, L.; Di Donato, A.; Farina, M.
Classificazione: 1 Contributo su Rivista
Abstract: In this work, an easy procedure for simulation of magnetically-Biased graphene is proposed: this allows using electromagnetic simulators even when gyrotropic materials are not included by the software. To this aim, the similarity of graphene with lossy ferrite has been exploited. The Duality Theorem is applied to establish the formal equivalence of a thin layer of un-biased ferrite with Biased graphene: boundary conditions and excitations are properly set in order to respect this equivalence. The simulation test-case is given by a resonating wire-antenna perturbed by the close proximity of a graphene patch: actually, simpler choices were possible, but the present test resembles the interaction of a microscope-tip with graphene, and may have some interesting fallouts on the experimental side. In order to validate the numerical results, all simulations are performed, for comparison, by independent tools, based on analytical and numerical methods
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/225561 Collegamento a IRIS

2015 Message From the Editor-In-Chief
IEEE TRANSACTIONS ON NANOTECHNOLOGY
Autore/i: Devittorio, Massimo; Dong, Lixin; Li, Jun; Martinez, Antonio; Costin, Anghel; Chen, Shih Chi; Krishna Ghatkesar, Murali; Saif Islam, M.; Li, Xiuling; Panoiu, Nicolae Coriolan; Pierantoni, Luca; Pontarelli, Salvatore; Samugawa, S.; Seshia, Ashwin A.; Suganuma, K.; Teuscher, Christof; Villanueva, Luis Guillermo; Wong, Pak; Wong, Tak Sing; Haixia Zhang, Alice; Zhong, Zhaohui; Lombardi, Fabrizio
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/225877 Collegamento a IRIS

2015 Ballistic simulation of Ratchet effect in antidot lattices patterned on graphene
2015 10TH EUROPEAN MICROWAVE INTEGRATED CIRCUITS CONFERENCE (EUMIC)
Autore/i: Pierantoni, Luca; Mencarelli, Davide; Coccetti, Fabio; Rozzi, Tullio
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this contribution, we investigate the mechanism governing the Ratchet effect in patterned monolayer graphene, at the ballistic nanoscale. Still smaller than currently achievable and manifacturable devices, the simulated structures serve to exemplify the dependence of charge scattering on the arrangement of lattice defects, i.e. clusters of atomic vacancies of triangular shape. The ballistic Ratchet effect is seen as cumulative multimode scattering of carriers in correspondence of the lattice discontinuities. An atomistic model, based on the Scattering Matrix method and making use of TB approximation, has been applied. The latter, in contrast with continuum models, like Dirac or Kubo-Drude derived formulas, is capable of describing abrupt discontinuities at sub-micrometric scales, where graphene is likely to preserve its outstanding properties. We believe that this work is a first step in the direction of engineering and design of devices based on the ballistic Ratchet effect, like RF and THz detectors
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/239153 Collegamento a IRIS

2015 Applications of graphene at microwave frequencies
RADIOENGINEERING
Autore/i: M. Bozzi; L. Pierantoni; S. Bellucci
Classificazione: 1 Contributo su Rivista
Abstract: In view to the epochal scenarios that nanotechnology discloses, nano-electronics has the potential to introduce a paradigm shift in electronic systems design similar to that of the transition from vacuum tubes to semiconductor devices. Since low dimensional (1D and 2D) nano-structured materials exhibit unprecedented electromechanical properties in a wide frequency range, including radio-frequencies (RF), microwave nano-electronics provides an enormous and yet widely undiscovered opportunity for the engineering community. Carbon nanoelectronics is one of the main research routes of RF/microwave nano-electronics. In particular, graphene has shown proven results as an emblematic protagonist, and a real solution for a wide variety of microwave electronic devices and circuits. This paper introduces graphene properties in the microwave range, and presents a paradigm of novel graphene-based devices and applications in the microwave/RF frequency range
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/234654 Collegamento a IRIS

2015 Introduction to the special issue
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
Autore/i: G. Chattopadhyay; F. Coccetti; L. Pierantoni; T. M. Wallis; I. Mehdi
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/248328 Collegamento a IRIS

2014 Measurement Techniques for RF nanoelectronics
IEEE MICROWAVE MAGAZINE
Autore/i: Wallis, T. M.; Pierantoni, Luca
Classificazione: 1 Contributo su Rivista
Abstract: The articles in this special section focus on measurement techniques for radio frequency nanoelectronic devices
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/158107 Collegamento a IRIS

2014 Numerical simulation of the combined quantum-electromagnetic problem in nano-structured devices
Proceedings of the 14th IEEE International Conference on Nanotechnology, IEEE-NANO 2014
Autore/i: Pierantoni, L.; Mencarelli, D.
Editore: Institute of Electrical and Electronics Engineers Inc
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Full-wave multiphysics techniques aimed at the investigation of the combined electromagnetic-coherent transport phenomena in carbon-based nano-structures/devices are presented. Advanced numerical tools, in the frequency (energy)-domain and time-domain and in multi-scale environment are derived. The quantum transport is modeled by i) discrete Hamiltonians at atomistic scale, ii) Schrödinger equation, and/or Dirac/Dirac-like eqs. at continuous level. In the frequency-domain, a rigorous Poisson-coherent transport equation system is provided. In the time-domain, Maxwell equations are self-consistently coupled to the Schrödinger/Dirac equations
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/225642 Collegamento a IRIS

2014 Carbon based ballistic RF electronics
Asia-Pacific Microwave Conference Proceedings
Autore/i: Coccetti, F.; Mencarelli, D.; Pierantoni, L.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In the past decade the progresses in nanofabrication, modeling (from atomistic to mesoscopic scales), and advances in nanocharacterisation have triggered an entirely new class of nanodevices. Owing to their superior electrical and mechanical performances, carbon based meterials such as graphene and carbon nanotubes (CNTs) have played a central role in these groundbreaking developments. Among the many, one of the most relevant feature of these materials is the capability to allow room temperature ballistic transport. This feature enables yet more compact and yet more efficient RF circuits, endowed of higher current density, higher on/off ratio and higher fmax/ft ratios. In this talk the activities ongoing in this area will be outlined through an European perspective by focusing on some emblematic examples of graphene based ballistic devices.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/225687 Collegamento a IRIS

2014 Full-wave techniques for the electromagnetic-quantum transport modeling in nano-devices
Proceeding of the 37th International Semiconductor Conference (CAS 2014)
Autore/i: Pierantoni, L.; Mencarelli, D.; Bozzi, M.; Moro, R.; Sindona, A.; Spurio, L.; Bellucci, S.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: We report on multiphysics full-wave techniques in the frequency (energy)-domain and time-domain, aimed at the investigation of the combined electromagnetic-coherent transport problem in nano-structured materials and devices, in particular carbon-based materials/devices. The quantum transport is modeled by i) discrete Hamiltonians at atomistic scale, ii) Schrödinger equation, and/or Dirac/Dirac-like eqs. at continuous level. In the frequency-domain, a rigorous Poisson-coherent transport equation system is provided. In the time-domain, Maxwell equations are self-consistently coupled to the Schrödinger/Dirac equations
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/225654 Collegamento a IRIS

2014 Efficient characterization of the electromagnetic-coupling of wire antennas- and graphene patches
Proceedings of the 8th IEEE European Conference on Antennas and Propagation (EuCAP2014)
Autore/i: Pierantoni, L.; Mencarelli, D.
Editore: Institute of Electrical and Electronics Engineers Inc
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this contribution, the simulation of electromagnetic coupling of a wire antenna and graphene by means of standard electromagnetic simulators, has been carried out. Simulations are performed at microwave frequency, from DC up to 100GHz, where the electromagnetic response of graphene is almost flat. The actual simulated device is given by a resonating wire-antenna, made of a CNT of finite conductivity, perturbed by the close proximity of a graphene patch: many other choices were possible, but the present test resembles the interaction of a microscope-tip with graphene, and may have some interesting fallouts on the experimental side. All the simulations are performed, for comparison, by an independent tool, based on the method of moments. © 2014 European Association on Antennas and Propagation
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/225653 Collegamento a IRIS

2014 Electromagnetic simulators for the modelling of magnetically biased graphene
Proceedings of the 2014 IEEE International Microwave Symposium (IMS), Microwave Symposium Digest
Autore/i: Mencarelli, D.; Pierantoni, L.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this work, a novel procedure for the simulation of magnetically-biased graphene by means of standard simulators, is made available. To this aim, the similarity of graphene with lossy ferrite has been exploited. Simulations can be performed at microwave frequency, from DC up to 100 GHz, where the electromagnetic response of graphene is almost flat. The Duality theorem is applied to establish the formal equivalence of a thin layer of un-biased ferrite with biased graphene: boundary conditions and excitations are properly set in order to respect this equivalence. The simulation test-case is given by transmission/reflection of a plane-wave through a graphene sheet, with normal incidence. In order to validate the numerical results, simulations are performed also by independent analytical methods
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/225746 Collegamento a IRIS

2014 Nanoscale modeling of three-contacts graphene ballistic junctions: Analysis of the non-linear transport
Proceedings of the IEEE MTT-S International Microwave Symposium (IMS), 2014
Autore/i: Mencarelli, D.; Pierantoni, L.; Coccetti, Fabio
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/225703 Collegamento a IRIS

2014 Full-Wave Techniques for the Multiphysics Quantum and Electrodynamics Modeling of Nanodevices
Proceedings of the 15th International Conference on Nanoscience & Nanotechnology 2014 (N&N 2014)
Autore/i: Pierantoni, L.; Mencarelli, D.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/225708 Collegamento a IRIS

2014 On the use of electrostatically doped graphene: Analysis of microwave attenuators
Proceedings of the 2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications, NEMO 2014
Autore/i: Pierantoni, L.; Bozzi, M.; Moro, R.; Mencarelli, D.; Bellucci, S.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this contribution, the electrostatic tunability of graphene is exploited in order to fabricate compact and effective microwave filters, namely field attenuators. A graphene patch of millimeter size is placed across the air gap of a discontinued microstrip-line, and tuned by means of an electrostatic bias applied by a high impedance line, that is, in turns, de-coupled from the microwave filter at center-band frequency. Results show that the filter response is strongly dependent on the external bias, and this promises not only for unprecedented performances, in terms of mass, volume and power consumption, but also for possible integration of graphene in a wide class of standard microwave device
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/225690 Collegamento a IRIS

2014 Radio-frequency nanoelectronics — Bridging the gap between nanotechnology and R.F. engineering applications
Proceedings of the 15th annual IEEE Wireless and Microwave Technology Conference (WAMICON 2014)
Autore/i: Pierantoni, Luca; Mencarelli, Davide
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In view to the new epochal scenarios that nanotechnology disclose, nanoelectronics has the potential to introduce a paradigm shift in electronic systems design similar to that of the transition from vacuum tubes to semiconductor devices. Since many nano-scale devices and materials exhibit their most interesting properties at radio-frequencies (RF), nanoelectronics provides an enormous and yet widely undiscovered opportunity for the microwave engineering community. The aim of RF nanoelectronics is to close the gap between the nanosciences and a new generation of multifunctional devices, circuits, and systems, for a broad range of applications and operating frequencies, up to the optical region. The paper presents an overview of some of the main research fields of RF nanoelectronics, by i) introducing theoretical foundations of the novel nano-scale materials (in particular, carbon nanotubes, graphene), ii) highlighting novel concepts and applications, iii) focusing on the investigation of the electromagnetics and quantum transport phenomena in nanodevices
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/225644 Collegamento a IRIS

2014 Graphene-based electronically tunable microstrip attenuator
IEEE MTT-S International Microwave Symposium (IMS), 2014
Autore/i: Pierantoni, Luca; Mencarelli, Davide; Bozzi, Maurizio; Moro, Riccardo; Bellucci, Stefano
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: This paper presents the design of a graphenebased electronically tunable microstrip attenuator operating at the frequency of 5 GHz. The use of graphene as a variable resistor is discussed, and the modeling of its electromagnetic properties at microwave frequencies is fully addressed. The design of the graphene-based attenuator is described. The structure integrates a patch of graphene, whose characteristics can range from fairly good conductor to highly lossy material, depending on the applied voltage. By applying the proper voltage through two high-impedance bias lines, the surface resistivity of graphene can be modified, thus changing the insertion loss of the microstrip attenuator
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/225685 Collegamento a IRIS

2014 Advanced techniques for the band structure-quantum transport modeling in graphene and 2D-materials beyond graphene
Proceedings of the 14th International Conference on Nanotechnology (IEEE-NANO), 2014
Autore/i: Pierantoni, Luca; Mencarelli, Davide; Sindona, A.; Gravina, M.; Pisarra, M.; Spurio, L.; Bellucci, S.
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: We report on advanced full-wave techniques, both in the frequency and energy domains, aimed at the investigation of the combined electromagnetic-coherent transport problem in pristine graphene, as well as in some 2Dmaterials beyond graphene, with particular attention to buckleld silicene
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/225704 Collegamento a IRIS

2014 GRAPHENE AS A TUNABLE RESISTOR
Proceedings of the International Semiconductor Conference (CAS)
Autore/i: S. Bellucci; M. Bozzi; A. Cataldo; R. Moro; D. Mencarelli; L. Pierantoni;
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: We present the design of a graphene-based electronically tuneable microstrip attenuator operating at a frequency of 5 GHz. The use of graphene as a variable resistor is discussed and the modelling of its electromagnetic properties at microwave frequencies is fully addressed. The design of the graphene-based attenuator is described. The structure integrates a patch of graphene, whose characteristics can range from being a fairly good conductor to a highly lossy material, depending on the applied voltage. By applying the proper voltage through two high-impedance bias lines, the surface resistivity of graphene can be modified, thereby changing the insertion loss of the microstrip attenuator
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/225706 Collegamento a IRIS

2014 Modeling and Simulation of Carbon Nanotransistors
Proceedings of the 15th International Conference on Nanoscience & Nanotechnology 2014
Autore/i: Mencarelli, Davide; Pierantoni, Luca
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/225707 Collegamento a IRIS

2014 Microwave applications of graphene for tunable devices
European Microwave Week 2014: Connecting the Future, EuMW 2014 - Conference Proceedings; EuMW 2014: 44th European Microwave Conference
Autore/i: PIERANTONI, Luca; MENCARELLI, Davide; Bozzi, Maurizio; Moro, Riccardo; Bellucci, Stefano
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this contribution, we simulate and design a electronically tunable microstrip attenuator based on graphene. To this aim, graphene is modeled as an ideal surface resistor at microwave frequency (5 GHz), changing with an external electric Bias. The presented device includes a patch of graphene, whose characteristics can range from fairly good conductor to highly lossy material, depending on the applied voltage. By applying the proper voltage through two high-impedance bias lines, the achieved change in the surface resistivity of graphene induces appreciable change of the insertion loss of the microstrip attenuator. © 2014 European Microwave Association-EUMA
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/241440 Collegamento a IRIS

2014 Organic conductors and semiconductors: recent achievements and modeling
“Organic conductors and semiconductors: recent achievements and modeling”, chapter of the book: “Green RFID Systems”
Autore/i: PIERANTONI, Luca; Lugli, Paolo
Editore: Cambridge University Press
Luogo di pubblicazione: Cambridge
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/225718 Collegamento a IRIS

2014 Microwave applications of graphene for tunable devices
Proceedings of the European Microwave Week 2014 (EuMW 2014)
Autore/i: Pierantoni, L.; Mencarelli, D.; Bozzi, M.; Moro, R.; Bellucci, S.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this contribution, we simulate and design a electronically tunable microstrip attenuator based on graphene. To this aim, graphene is modeled as an ideal surface resistor at microwave frequency (5 GHz), changing with an external electric Bias. The presented device includes a patch of graphene, whose characteristics can range from fairly good conductor to highly lossy material, depending on the applied voltage. By applying the proper voltage through two high-impedance bias lines, the achieved change in the surface resistivity of graphene induces appreciable change of the insertion loss of the microstrip attenuator
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/278117 Collegamento a IRIS

2014 Graphene-based Electronically Tuneable Microstrip Attenuator
NANOMATERIALS AND NANOTECHNOLOGY
Autore/i: Pierantoni, Luca; Mencarelli, Davide; Bozzi, Maurizio; Moro, Ricardo; Bellucci, Stefano
Classificazione: 1 Contributo su Rivista
Abstract: This paper presents the design of a graphenebased electronically tuneable microstrip attenuator operating at a frequency of 5 GHz. The use of graphene as a variable resistor is discussed and the modelling of its electromagnetic properties at microwave frequencies is fully addressed. The design of the graphene-based attenuator is described. The structure integrates a patch of graphene, whose characteristics can range from being a fairly good conductor to a highly lossy material, depending on the applied voltage. By applying the proper voltage through two high-impedance bias lines, the surface resistivity of graphene can be modified, thereby changing the insertion loss of the microstrip attenuator
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/225717 Collegamento a IRIS

2014 Nanoscale Simulation of Three-contact Graphene Ballistic Junctions
NANOMATERIALS AND NANOTECHNOLOGY
Autore/i: Mencarelli, Davide; Pierantoni, Luca; Rozzi, Tullio; Coccetti, Fabio
Classificazione: 1 Contributo su Rivista
Abstract: In this work, three-terminal ballistic junctions, made of three-branch graphene nanoribbons (GNRs), are considered and simulated at the nanometric scale. The analysis is carried out by a scattering matrix approach, in a discrete formulation optimized for GNR devices. The ballisticity and the scattering properties of the junction contribute to the nonlinear behaviour, as, in fact, a sinusoidal voltage between two GNR branches results in a non-sinusoidal current at the third branch. The inputoutput characteristic is hardly predictable at the nanoscale, as it depends on several cooperating factors, namely the potential distribution and the geometry of the junction. Several numerical examples are shown to illustrate the above concepts
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/225716 Collegamento a IRIS

2013 Design of a Coplanar Graphene-Based Nano-Patch Antenna for Microwave Applications
Proceedings of the 2013 International Microwave Symposium (IMS), Microwave Symposium Digest
Autore/i: Mencarelli D.; Dragoman M.; Pierantoni L.; Rozzi T.; Coccetti F.
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: We analyze a coplanar graphene-based nanopatch antenna. Besides the fact that graphene is a moderate conductor at those frequencies, the antenna can still exhibit sharp resonances. Although the poor graphene conductivity implies in general low-performance, a remarkable change of the scattering parameters, radiation pattern and antenna efficiency can be observed as the graphene surface impedance is changed by means of an external Bias.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/125866 Collegamento a IRIS

2013 Graphene-based wireless communications systems: Analysis of the EM-quantum transport of coupled nano-patch antennas
Proceedings of the 1th 2013 IEEE Wireless Power Transfer Conference, (WPTC) 2013
Autore/i: Pierantoni L.; Mencarelli D.; Coccetti F.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The possibility of using graphene-based antennas is a core point in the development of high speed, multifunctional new wireless architecture, leading to a new generation of smart nano-systems for wireless communications, and wireless power transfer. In this work, we present a first analysis of the electromagnetic-quantum transport among the different graphene-based antennas. The former analysis is a building block for the design of a complete smart nanosystems for wireless communications at micro and mm-wave frequencies
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/125865 Collegamento a IRIS

2013 Advanced modeling of graphene nanodevices: Metal-carbon transition and patch antennas
Proceedings of the 7th European Conference on Antennas and Propagation (EuCAP), 2013
Autore/i: Pierantoni L.; Mencarelli D.; Coccetti F.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: We report on multiphysics full-wave techniques in the frequency (energy)-domain and the time-domain, aimed at the investigation of the combined electromagnetic-coherent transport problem in carbon based nano-structured materials and devices, e.g. graphene nanoribbons. The frequency-domain approach is introduced in order to describe a Poisson/Schroedinger system in a quasi static framework. An example about the self-consistent solution of laterally coupled graphene nanoribbons is shown. The time-domain approach deals with the solution of the combined Maxwell/Schroedinger system of equations. We deal with i) the very challenging problem of he analysis of charge injection from metal to a contacted graphene nanoribbon (GNR); ii) a first prototype of graphene-based patch antenna.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/125863 Collegamento a IRIS

2013 Analysis of a Microwave Graphene-Based Patch Antenna
Proceedings of the 43rd European Microwave Conference
Autore/i: Pierantoni L.; Dragoman M.; Mencarelli D.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The possibility of using graphene-based antennas is a core point in the development of high speed, multifunctional devices, leading to a new generation of smart nano-systems for wireless applications. In this work, we present a first analysis of the electromagnetic radiation from graphene-based antennas, at microwave frequencies. Moreover, a numerical analysis of the coupling between graphene patches is reported
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/126063 Collegamento a IRIS

2012 Advanced Techniques for the Investigation of the Combined Electromagnetic-Quantum Transport Phenomena in Carbon Nanodevices
Proceedings of the International Conference on Electromagnetics in Advanced Applications (ICEAA)
Autore/i: Pierantoni L.; Mencarelli D.; Rozzi T.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this contribution, we report on the analysis of charge transport in graphene nanoribbons by means of timedomain and frequency-domain techniques. The former can be applied in order to describe the Maxwell/Schroedinger coupled system of equations, and the letter are used to solve the Poisson/Schroedinger system in a quasi static framework. A frequency-domain example about the self-consistent solution of laterally coupled graphene nanoribbons is reported. A time-domain example is also reported, showing the effect of the self-generated electromagnetic field, that may affect the dynamics of the charge wavepacket.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/80948 Collegamento a IRIS

2012 Radio-Frequency Nanoelectronics – Bridging the Gap between Nanotechnology and R.F. Engineering Applications
Proceedings of the 12th International Workshop on Nanoscience & Nanotechnology
Autore/i: L. Pierantoni
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/83120 Collegamento a IRIS

2012 Multiphysics Techniques for the Electromagnetic/Coherent-Transport Problem in Carbon Nanodevices: Analysis of the Metal-Carbon Transition
Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation (AP-S) and USNC-URSI National Radio Science Meeting
Autore/i: L. Pierantoni; D. Mencarelli; A. Di Donato; T. Rozzi
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/82727 Collegamento a IRIS

2012 Multiphysics Modeling of the Electromagnetic/Coherent-Transport Phenomena in Graphene Nanodevices
Proceedings of the 15th European Microwave Week (EuMW). Notes of the Workshop on” Graphene RF Nanoelectronics”
Autore/i: L. Pierantoni
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/82726 Collegamento a IRIS

2012 Extending ballistic graphene FET lumped element models to diffusive devices
SOLID-STATE ELECTRONICS
Autore/i: Vincenzi G.; Deligeorgis G.; Coccetti F.; Dragoman M.; Pierantoni L.; Mencarelli D.; Plana R.
Classificazione: 1 Contributo su Rivista
Abstract: In this work, a modified, lumped element graphene field effect device model is presented. The model is based on the “Top-of-the-barrier” approach which is usually valid only for ballistic graphene nanotransistors. Proper modifications are introduced to extend the model’s validity so that it accurately describes both ballistic and diffusive graphene devices. The model is compared to data already presented in the literature. It is shown that a good agreement is obtained for both nano-sized and large area graphene based channels. Accurate prediction of drain current and transconductance for both cases is obtained
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/80093 Collegamento a IRIS

2012 Graphene Modeling by TLM approach
Microwave Symposium Digest, 2012 International Microwave Symposium
Autore/i: Mencarelli D.; Pierantoni L.; Rozzi T.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: We introduce for the first time a condensed node scheme for solving the Dirac equation in 2D graphene. This scheme satisfies the standard charge conservation requirement and allows adopting boundary conditions for graphene circuits. The correlation between the graphene equations and its self-consistent symmetrical condensed node -transmission line matrix formulation is highlighted. This concept, in turn, is related to the generalized Huygens principle for the Dirac equations
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/80950 Collegamento a IRIS

2012 Analysis of the metal work function dependence of charge transfer in contacted graphene nanoribbons
NANOMATERIALS AND NANOTECHNOLOGY
Autore/i: D. Mencarelli; L. Pierantoni
Classificazione: 1 Contributo su Rivista
Abstract: In this paper, the analysis of charge injection from metal to a contacted graphene nanoribbon (GNR) is developed by means of a scattering matrix approach. The charge transport, described by the Schrödinger equation in the 2D domain of the GNRs, is solved, together with the 3D Poisson equation for the potential distribution. Varying the work function of the metal contacted to the GNR, alters the so-called “metal doping”, i.e., the amount of charge in the GNR. As easily expected, this in turn affects the I-V characteristic of a GNR channel across two electrodes. Interesting effects appear as the contribution of GNR sub-band is considered and included in the self-consistent calculation
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/83131 Collegamento a IRIS

2012 Numerical Techniques for the Analysis of Charge Transport and Electrodynamics in Graphene Nanoribbons
NANOMATERIALS AND NANOTECHNOLOGY
Autore/i: L. Pierantoni; D. Mencarelli
Classificazione: 1 Contributo su Rivista
Abstract: In this paper, we report on multiphysics full-wave techniques in the frequency (energy)-domain and the time-domain, aimed at the investigation of the combined electromagnetic-coherent transport problem in carbon based on nano-structured materials and devices, e.g., graphene nanoribbons. The frequency-domain approach is introduced in order to describe a Poisson/Schrödinger system in a quasi static framework. An example of the self-consistent solution of laterally coupled graphene nanoribbons is shown. The time-domain approach deals with the solution of the combined Maxwell/Schrödinger system of equations. The propagation of a charge wavepacket is reported, showing the effect of the self-generated electromagnetic field that affects the dynamics of the charge wavepacket
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/83609 Collegamento a IRIS

2012 Advanced modeling of the electrostatic field coupling in graphene nanoribbons
CARBON SCIENCE AND TECHNOLOGY
Autore/i: Luca Pierantoni
Classificazione: 1 Contributo su Rivista
Abstract: The field coupling of Graphene NanoRibbons (GNR), which is very important from the view point of realistic configurations/applications such as in field effect transistor, interconnects, plasmonic transmission lines, is analyzed and presented in this communication. We consider the quasi-static response of two GNRs coupled by Coulomb interaction : the Schrödinger equation in the two dimensional (2D) domain of the GNRs is solved togetherwith the three dimensional (3D) Poisson equation. It is observed that, unless the two GNRs are very close to each other, their Coulomb interaction is not so strong, in the sense that their charge and potential distributions are just slightly distorted by the presenceof the other GNR. The effect is even lower in the case of semimetallic GNRs, where the modulation of current and charge by external potential is known to be intrinsically small, owing to the absence of an energy band gap
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/126263 Collegamento a IRIS

2012 Full-Wave techniques for the analysis of electrodynamics and coherent quantum transport in graphene nanodevices
CARBON SCIENCE AND TECHNOLOGY
Autore/i: Luca Pierantoni
Classificazione: 1 Contributo su Rivista
Abstract: We report on full-wave techniques in the frequency (energy)-domain and the time-domain, aimed at the investigation of the combined electromagnetic-coherent transport problemin carbon based nanostructured materials and devices viz. graphene nanoribbons. The frequency-domain approach is introduced in order to describe a Poisson-Schrödinger/Dirac system in a quasi static framework. The time-domain approach deals with the full-wave solution of the combined Maxwell-Schrödinger/Dirac system of equations. From the above theoretical platforms, home-made solvers are provided, aimed at dealing with challenging problems in realistic devices/systems environments, typical of the area of radio-frequency nanoelectronics
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/119662 Collegamento a IRIS


Università Politecnica delle Marche

P.zza Roma 22, 60121 Ancona
Tel (+39) 071.220.1, Fax (+39) 071.220.2324
P.I. 00382520427