Dr. Luca Varani Profile

Dr. Luca Varani

at Univ Montpellier

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Publications (9)

Proceedings Article | 30 September 2022 Paper

Long-range electrodynamic interactions between proteins assessed by THz spectroscopy

Sandra Ruffenach, Mathias Lechelon, Yoann Meriguet, Matteo Gori, Ilaria Nardecchia, Elena Floriani, Dominique Coquillat, Frédéric Teppe, Sébastien Mailfert, Pierre Ferrier, Luca Varani, James Sturgis, Didier Marguet, Marco Pettini, Jeremie Torres

Proceedings Volume 12230, 122300H (2022) https://doi.org/10.1117/12.2641104

KEYWORDS: Proteins, Terahertz radiation, Spectroscopy, Electrodynamics, Molecular interactions, Near field optics

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Proceedings Article | 27 March 2013 Paper

Room temperature generation of THz radiation in GaN quantum wells structures

A. Penot, J. Torres, P. Nouvel, L. Varani, F. Teppe, C. Consejo, N. Dyakonova, W. Knap, Y. Cordier, S. Chenot, M. Chmielowska, J.-P. Faurie, B. Beaumont, P. Shiktorov, E. Starikov, V. Gruzinskis

Proceedings Volume 8624, 862409 (2013) https://doi.org/10.1117/12.2002504

KEYWORDS: Terahertz radiation, Gallium nitride, Quantum wells, Plasma, Dielectrics, Antennas, Temperature metrology, Spectroscopy, Heterojunctions, Mirrors

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Proceedings Article | 1 March 2012 Paper

THz transmission modulated by a dc-bias through GaN quantum well structure

A. Penot, J. Torres, T. Laurent, R. Sharma, P. Nouvel, S. Blin, L. Varani, W. Knap, Y. Codier, M. Chmielowska, S. Chenot, J.-P. Faurie, B. Beaumont, P. Shiktorov, E. Starikov, V. Gruzinskis, V. Korotyeyev, V. Kochelap

Proceedings Volume 8261, 826111 (2012) https://doi.org/10.1117/12.905958

KEYWORDS: Terahertz radiation, Electrons, Gallium nitride, Temperature metrology, Quantum wells, Sapphire, Resistance, Nitrogen, Modulation, Physics

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Proceedings Article | 23 January 2010 Paper

Efficient terahertz mixer from plasma wave downconversion in InGaAs HEMT

L. Chusseau, J. Torres, P. Nouvel, H. Marinchio, L. Varani, J.-F. Lampin, S. Bollaert, Y. Roelens, D. Dolfi

Proceedings Volume 7608, 760816 (2010) https://doi.org/10.1117/12.846874

KEYWORDS: Plasma, Field effect transistors, Terahertz radiation, Transistors, Modulation, Indium gallium arsenide, Heterodyning, Cryogenics, Plasma spectroscopy, Spectroscopy

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Proceedings Article | 25 January 2007 Paper

Generation of coherent terahertz radiation due to optical-phonon emission assisted transit-time resonance in quantum wells and heterolayers

Pavel Shiktorov, Evgenij Starikov, Viktoras Gružinskis, Luca Varani, Christophe Palermo, Jean-François Millithaler

Proceedings Volume 6596, 65960A (2007) https://doi.org/10.1117/12.726365

KEYWORDS: Quantum wells, Terahertz radiation, Scattering, Phonons, Gallium nitride, Electrons, 3D modeling, Optical spheres, Acoustics, Monte Carlo methods

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Proceedings Article | 25 May 2004 Paper

Noise in Schottky-barrier diodes: from static- to large-signal operation

Susana Perez, Pavel Shiktorov, Tomás González, Evjeni Starikov, Viktor Gruzinskis, Lino Reggiani, Luca Varani, J. Vaissiere

Proceedings Volume 5470, (2004) https://doi.org/10.1117/12.546666

KEYWORDS: Microchannel plates, Terahertz radiation, Capacitance, Signal to noise ratio, Monte Carlo methods, Interference (communication), Solids, Fourier transforms, Diodes, Resistance

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Proceedings Article | 25 May 2004 Paper

Nonlocal effects and transfer fields for electronic noise in small devices

Luca Varani, Jean Vaissiere, Pavel Shiktorov, Evjeni Starikov, Viktor Gruzhinskis, Tomas Gonzalez, Javier Mateos, Daniel Pardo, Lino Reggiani

Proceedings Volume 5470, (2004) https://doi.org/10.1117/12.545597

KEYWORDS: Scattering, Correlation function, Picosecond phenomena, Diffusion, Gallium arsenide, Resistance, Atrial fibrillation, Semiconductors, Doping, Terahertz radiation

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Proceedings Article | 12 May 2003 Paper

Microscopic investigation of large-signal noise in semiconductor materials and devices

Tomas Gonzalez, Susana Perez, Eugenij Starikov, Pavel Shiktorov, Viktoras Gruzinskis, Lino Reggiani, Luca Varani, Jean Claude Vaissiere

Proceedings Volume 5113, (2003) https://doi.org/10.1117/12.488959

KEYWORDS: Upconversion, Semiconductors, Gallium arsenide, Correlation function, Phonons, Interference (communication), Stochastic processes, Picosecond phenomena, Scattering, Terahertz radiation

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The investigation of noise in electronic devices operating under large-signal conditions is attracting increasing attention in recent years. Theoretical analyses on this subject are typically performed in the framework of the impedance field method, implemented under the drift-diffusion approximation. As an alternative, a more general microscopic approach including a more detailed physical description of the systems is mandatory. This work reviews recent results of Monte Carlo simulations of electronic noise in bulk materials and submicron semiconductor structures subject to high-frequency large-amplitude periodic electric fields or applied voltages/currents. The peculiarity of the noise analysis under large-signal operation is that velocity or current/voltage fluctuations appear simultaneously with the regular response of the nonlinear medium or device, so that the regular response and noise spectra are overlapped in the whole frequency range of interest. Here, various correlation functions of fluctuations, their instantaneous and integrated spectral densities, etc. are calculated under large-signal operation for compound semiconductors, such as GaAs, and InN, as well as for GaAs Schottky-barrrier diodes and n+nn+ structures. A comparison with the results obtained under stationary conditions is performed. Under these large-signal cyclostationary working conditions, when the system response becomes nonlinear, several modifications and anomalies appear in the noise spectra with respect to static stationary conditions. In particular, an increase of the low-frequency noise and a resonant-like enhancement of the spectra near the fundamental frequency (and eventually high-order harmonics) of the applied signal is observed under some specific conditions. These anomalies are interpreted as a manifestation of dynamical effects under sufficiently high frequency and amplitude of the applied signal. Similarities and differences of the noise resonant-like enhancement around the fundamental frequency with noise upconversion processes are discussed.

Proceedings Article | 10 April 2001 Paper

Monte Carlo simulation of small- and large-signal response operation of a GaN THz maser

Eugenijus Starikov, P. Shiktorov, Viktoras Gruzinskis, Lino Reggiani, L. Varani, J. Vaissiere, Jian Zhao

Proceedings Volume 4415, (2001) https://doi.org/10.1117/12.425491

KEYWORDS: Terahertz radiation, Gallium nitride, Monte Carlo methods, Microwave radiation, Phonons, Liquids, Nitrogen, Doping

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