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Your search keyword '"Nano-Optique et Forces (NOF)"' showing total 4 results
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4 results on '"Nano-Optique et Forces (NOF)"'

1. Nanoscale Radiative Heat Flow due to Surface Plasmons in Graphene and Doped Silicon

Author

Joël Chevrier, Claire Berger, W. A. de Heer, S. Thiele, P. J. van Zwol, Nano-Optique et Forces (NOF), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Circuits électroniques quantiques Alpes (QuantECA), School of Physics [Atlanta], and Georgia Institute of Technology [Atlanta]

Subjects
Materials science, Silicon, Physics::Optics, General Physics and Astronomy, chemistry.chemical_element, 02 engineering and technology, Electronic structure, 01 natural sciences, 7. Clean energy, law.invention, Condensed Matter::Materials Science, law, 0103 physical sciences, Physics::Atomic and Molecular Clusters, 010306 general physics, Plasmon, Condensed matter physics, Graphene, Doping, Surface plasmon, 021001 nanoscience & nanotechnology, chemistry, Heat flux, Thermal radiation, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], 0210 nano-technology
Abstract

4 pages, 3 figures; International audience; Owing to its two dimensional electronic structure, graphene exhibits many unique properties. One of them is a wave vector and temperature dependent plasmon in the infrared range. Theory predicts that due to these plasmons, graphene can be used as a universal material to enhance nanoscale radiative heat exchange for any dielectric substrate. Here we report on radiative heat transfer experiments between SiC and a SiO2 sphere which have non matching phonon polariton frequencies, and thus only weakly exchange heat in near field. We observed that the heat flux contribution of graphene epitaxially grown on SiC dominates at short distances. The influence of plasmons on radiative heat transfer is further supported with measurements for doped silicon. These results highlight graphenes strong potential in photonic nearfield and energy conversion devices.

Published
2012

2. Tuning Near Field Radiative Heat Flux through Surface Excitations with a Metal Insulator Transition

Author

Joël Chevrier, P. J. van Zwol, Laurent Ranno, Micro et NanoMagnétisme (MNM), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), and Nano-Optique et Forces (NOF)

Subjects
Physics, Phase transition, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed matter physics, business.industry, FOS: Physical sciences, General Physics and Astronomy, Insulator (electricity), Near and far field, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Derjaguin approximation, Thermal insulation, Thermal radiation, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 0103 physical sciences, Polariton, 010306 general physics, 0210 nano-technology, Radiative heat flux, business, ComputingMilieux_MISCELLANEOUS
Abstract

The control of heat flow is a formidable challenge due to lack of good thermal insulators. Promising new oppor-tunities for heat flow control were recently theoretically discovered for radiative heat flow in near field, where large heat flow contrasts may be achieved by tuning electronic excitations on surfaces. Here we show experi-mentally that the phase transition of VO2 entails a change of surface polariton states that significantly affects radiative heat transfer in near field. In all cases the Derjaguin approximation correctly predicted radiative heat transfer in near field, but it underestimated the farfield limit. Our results indicate that heat flow contrasts can be realized in near field that can be larger than those obtained in farfield., 3 figures

Published
2012

3. Transport Inefficiency in Branched-Out Mesoscopic Networks: An Analog of the Braess Paradox

Author

Marco G. Pala, Xavier Wallart, Hermann Sellier, Serge Huant, Peng Liu, Vincent Bayot, Ludovic Desplanque, Samuel E. Baltazar, Frederico Rodrigues Martins, Benoît Hackens, Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation (IMEP-LAHC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National Polytechnique de Grenoble (INPG)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Nano-Electronique Quantique et Spectroscopie (NEEL - QuNES), Institut Néel (NEEL), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), Dispositifs Intégrés et Circuits Electroniques Machine Learning Group (DICE - MLG), Université Catholique de Louvain = Catholic University of Louvain (UCL), Nano-Optique et Forces (NEEL - NOF), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Nano-Electronique Quantique et Spectroscopie (QuNES), and Nano-Optique et Forces (NOF)

Subjects
Quantum decoherence, quantum statistical methods, FOS: Physical sciences, General Physics and Astronomy, 02 engineering and technology, 01 natural sciences, Electronic transport in mesoscopic systems, Quantum transport, Quantum mechanics, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 0103 physical sciences, Statistical physics, 010306 general physics, [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall], Physics, Mesoscopic physics, Condensed Matter - Mesoscale and Nanoscale Physics, Computer simulation, Conductance, Decoherence, 021001 nanoscience & nanotechnology, open systems, Networks and genealogical trees, 0210 nano-technology, Inefficiency, Scanning probe microscopes and components
Abstract

We present evidence for a counter-intuitive behavior of semiconductor mesoscopic networks that is the analog of the Braess paradox encountered in classical networks. A numerical simulation of quantum transport in a two-branch mesoscopic network reveals that adding a third branch can paradoxically induce transport inefficiency that manifests itself in a sizable conductance drop of the network. A scanning-probe experiment using a biased tip to modulate the transmission of one branch in the network reveals the occurrence of this paradox by mapping the conductance variation as a function of the tip voltage and position., 2nd version with minor stylistic corrections. To appear in Phys. Rev. Lett.: Editorially approved for publication 6 January 2012

Published
2012

4. Viscous cavity damping of a microlever in a simple fluid

Author

Joël Chevrier, Fabio Comin, Aurélien Drezet, Serge Huant, Alessandro Siria, Florence Marchi, Nano-Optique et Forces (NOF), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), CSIC, and Instituto Pirenaico de Ecologia

Subjects
[PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn], business.product_category, Microfluidics, General Physics and Astronomy, FOS: Physical sciences, 02 engineering and technology, Slip (materials science), Microscopy, Atomic Force, 01 natural sciences, Physics::Fluid Dynamics, Viscosity, 0103 physical sciences, Nanotechnology, Boundary value problem, 010306 general physics, Softening, Brownian motion, Physics, Lever, Fluid Dynamics (physics.flu-dyn), Laminar flow, Physics - Fluid Dynamics, Mechanics, 021001 nanoscience & nanotechnology, Models, Chemical, 0210 nano-technology, business
Abstract

We consider the problem of oscillation damping in air of a thermally actuated microlever as it is gradually approached towards an infinite wall in parallel geometry. As the gap is decreased from 20 nm down to 400 nm, we observe the increasing damping of the lever Brownian motion in the fluid laminar regime. This manifests itself as a linear decrease with distance of the lever quality factor accompanied by a dramatic softening of its resonance, and eventually leads to the freezing of the CL oscillation. We are able to quantitatively explain this behavior by analytically solving the Navier-Stokes equation with perfect slip boundary conditions. Our findings may have implications for microfluidics and micro- nano-electromechanical applications., Comment: Phys. Rev. Lett.: submitted 6 February 2009 ; Editorially approved for publication 3 June 2009

Published
2009

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