Publications de Michele Tamagnone

Nonlinear THz spectroscopy and simulation of gated graphene

Juan Ramon Mosig, Matthias Gäumann, Michele Tamagnone

We studied the nonlinear optical properties of single layer graphene using high terahertz (THz) fields. With the use of a back gate and cooling down the sample to cryogenic temperatures we are able to spectrally probe the nonlinear THz properties of intrin ...

IOP PUBLISHING LTD2018

Modulated scattering technique in the terahertz domain enabled by current actuated vanadium dioxide switches

Juan Ramon Mosig, Anja Skrivervik, Mihai Adrian Ionescu, Michele Tamagnone, Wolfgang Amadeus Vitale, Santiago Capdevila Cascante

The modulated scattering technique is based on the use of reconfigurable electromagnetic scatterers, structures able to scatter and modulate an impinging electromagnetic field in function of a control signal. The modulated scattering technique is used in a ...

Nature Research2017

Shunt capacitive switches based on VO2 metal insulator transition for RF phase shifter applications

Mihai Adrian Ionescu, Andreas Schueler, Mariazel de la Candelas Maqueda López, Anna Krammer, Josef Andreas Schuler, Montserrat Fernandez-Bolanos Badia, Michele Tamagnone, Wolfgang Amadeus Vitale, Emanuele Andrea Casu, Nicolò Oliva

IEEE2017

Tri-Band, Polarization-Independent Reflectarray at Terahertz Frequencies: Design, Fabrication, and Measurement

Juan Ramon Mosig, Mihai Adrian Ionescu, Anja Skrivervik, Clara-Fausta Moldovan, Julien Perruisseau-Carrier, Michele Tamagnone, Santiago Capdevila Cascante, Hamed Hasani, Pietro Maoddi

In this paper, two THz reflectarray surfaces have been designed and fabricated in order to deflect a plane wave with any polarization and with a specific incident angle to three different specific directions each at distinct three frequencies of 0.7, 1.0 a ...

Ieee-Inst Electrical Electronics Engineers Inc2016

Graphene Quantum Capacitors for High Frequency Tunable Analog Applications

Juan Ramon Mosig, Mihai Adrian Ionescu, Clara-Fausta Moldovan, Michele Tamagnone, Pankaj Sharma, Wolfgang Amadeus Vitale

Graphene quantum capacitors (GQC) are demonstrated to be enablers of radio-frequency (RF) functions through voltage-tuning of their capacitance. We show that GQC complements MEMS and MOSFETs in terms of performance for high frequency analog applications an ...

American Chemical Society (ACS)2016

Theory, design and measurement of near-optimal graphene reconfigurable and non-reciprocal devices at terahertz frequencies

Michele Tamagnone

This thesis explores the applications of graphene for terahertz and far infrared optical components and antennas, with particular emphasis on tunable and non-reciprocal devices. Both terahertz technologies and graphene are emerging fields which hold many p ...

EPFL2016

Theoretical Limits on the Efficiency of Reconfigurable and Nonreciprocal Graphene Antennas

Juan Ramon Mosig, Michele Tamagnone

Theoretical upper limits on the radiation efficiency of reconfigurable antennas based on graphene are presented in closed form and discussed. The theory provides useful information for the design of these structures independently of the type and geometry o ...

Ieee-Inst Electrical Electronics Engineers Inc2016

Near optimal graphene terahertz non-reciprocal isolator

Juan Ramon Mosig, Mihai Adrian Ionescu, Julien Perruisseau-Carrier, Clara-Fausta Moldovan, Michele Tamagnone

Isolators, or optical diodes, are devices enabling unidirectional light propagation by using non-reciprocal optical materials, namely materials able to break Lorentz reciprocity. The realization of isolators at terahertz frequencies is a very important ope ...

Nature Publishing Group2016

Field-enhanced design of steep-slope VO2 switches for low actuation voltage

Juan Ramon Mosig, Mihai Adrian Ionescu, Clara-Fausta Moldovan, Michele Tamagnone, Wolfgang Amadeus Vitale, Emanuele Andrea Casu, Luca Petit

The abrupt metal-insulator transition in vanadium dioxide (VO2) offers novel performance and functionality for beyond CMOS switches, enabling simultaneous high ON current and ultra-steep subthreshold slope with low temperature dependence. We developed a fi ...

IEEE2016

Graphene quantum capacitors for high-Q tunable LC-tanks for RF ICs

Juan Ramon Mosig, Mihai Adrian Ionescu, Clara-Fausta Moldovan, Michele Tamagnone, Wolfgang Amadeus Vitale

We propose and characterize graphene quantum capacitors, tunable with voltage by the control of their charge density, for tunable LC tanks as essential building blocks for Radio-Frequency (RF) functions in densely integrated circuits. We fabricate and inve ...

IEEE2016