ANTEZZA Mauro
Fonction : EnseignantChercheur
Organisme : Université Montpellier
Maître de Conférences
(HDR)
mauro.antezza
umontpellier.fr
0467143829
Bureau: 31.0, Etg: 2, Bât: 21  Site : Campus Triolet
Administration Nationale: Elu/nommé au comité national CNRS
 Expert ANR
 Élu au Bureau de l'IUF  Ministère ENESR
 Elu/nommé au CS/CSD CNRS ou IRD

Administration Locale: Membre d'un pool d'experts
 Direction d'équipe

Curriculum Vitae: 
'10today : associate prof., University of Montpellier '07'10 : postdoc, École Normale Supérieure  Paris '06'07 : postdoc, University of Trento '03'06 : PhD (physics), University of Trento '99'03 : Laurea (physics), University of Pavia 
Activités de Recherche: 
Ultracold Quantum Gases, CasimirLifshitz Interaction, Nonequilibrium Systems, RadiationMatter Interaction, Disordered Systems 
Domaines de Recherche:  Physique/Physique Quantique
 Physique/Matière Condensée/Gaz Quantiques
 Physique/Physique/Agrégats Moléculaires et Atomiques
 Physique/Physique/Physique Atomique
 Physique/Physique/Optique

Dernieres productions scientifiques :


Inducing and controlling rotation on small objects using photonic topological materials
Auteur(s): Frieder Lindel, Hanson George w., Antezza M., Buhmann Stefan yoshi
(Article) Publié:
Physical Review B, vol. 98 p.144101 (2018)
Ref HAL: hal01885407_v1
DOI: 10.1103/PhysRevB.98.144101
Exporter : BibTex  endNote
Résumé: Photonic topological insulator plates violate Lorentz reciprocity, which leads to a directionality of surfaceguided modes. This inplane directionality can be imprinted via an applied magnetic field. On the basis of macroscopic quantum electrodynamics in nonreciprocal media, we show that two photonic topological insulator surfaces are subject to a tunable, magneticfielddependent Casimir torque. Due to the directionality, this torque exhibits a unique 2π periodicity, in contradistinction to the Casimir torques encountered for reciprocal uniaxial birefringent media or corrugated surfaces which are π periodic. Remarkably, the torque direction and strength can be externally driven in situ by simply applying a magnetic field on the system, and we show that this can be exploited to induce a control of the rotation of small objects. Our predictions are relevant for nanooptomechanical experiments and devices.



Optical torque on a twolevel system near a strongly nonreciprocal medium
Auteur(s): Hassani gangaraj S. ali, Silveirinha Mario, Hanson George w., Antezza M., Monticone Francesco
(Article) Publié:
Physical Review B, vol. 98 p.125146 (2018)
Ref HAL: hal01883367_v1
DOI: 10.1103/PhysRevB.98.125146
Exporter : BibTex  endNote
Résumé: We investigate the quantum optical torque on an atom interacting with an inhomogeneous electromagnetic environment described by the most general linear constitutive relations. The atom is modeled as a twolevel system prepared in an arbitrary initial energy state. Using the Heisenberg equation of motion (HEM) and under the Markov approximation, we show that the optical torque has a resonant and nonresonant part, associated, respectively, with a spontaneousemission process and Casimirtype interactions with the quantum vacuum, which can both be written explicitly in terms of the system Green function. Our formulation is valid for any threedimensional inhomogeneous, dissipative, dispersive, nonreciprocal, and bianisotropic structure. We apply this general theory to a scenario in which the atom interacts with a material characterized by strong nonreciprocity and modal unidirectionality. In this case, the main decay channel of the atom energy is represented by the unidirectional surface waves launched at the nonreciprocal materialvacuum interface. To provide relevant physical insight into the role of these unidirectional surface waves in the emergence of nontrivial optical torque, we derive closedform expressions for the induced torque under the quasistatic approximation. Finally, we investigate the equilibrium states of the atom polarization, along which the atom spontaneously tends to align due to the action of the torque. Our theoretical predictions may be experimentally tested with cold Rydberg atoms and superconducting qubits near a nonreciprocal material. We believe that our general theory may find broad application in the context of nanomechanical and biomechanical systems.



Casimir Forces between Silicon Gratings
Auteur(s): Chan Ho bun, Wang Mingkang, Tang Lu, Ng C. Y., Chan Che ting, Messina R., Guizal B., Antezza M., Crosse John alexander
Conférence invité: PIERS : Progress In Electromagnetics Research Symposium (Toyama, JP, 20180801)
Ref HAL: hal01864295_v1
Exporter : BibTex  endNote
Résumé: The Casimir force arises from the quantum fluctuations of the electromagnetic field. It leads to an attraction between electrically neutral bodies with a vacuum gap that be comes measureable at nanoscale separations. Under the trend of miniaturization, such quantum electrodynamical effects are expected to play an important role in nanomechanical devices. One remarkable property of the Casimir force is its nontrivial dependence on the shape of the in teracting bodies. Experiments using the corrugated surface of gratings have demonstrated the deviation of the Casimir force from the proximity force approximation. In these experiments, it was necessary to choose one of the bodies to be a sphere to circumvent alignment difficulties.Here, we present measurement of the Casimir force gradient between two microfabricated silicon beams, both of which contain rectangular corrugations. One of the beams acts as the forcesensing element. As it vibrates in a perpendicular magnetic field, a back electromotive force is generated and the corresponding change in the current is measured. The force gradient exerted on this beam is measured from the resonance frequency shift. The distance to the other beam is controlled using a comb actuator integrated on the same substrate, where electrostatic forces push the second beam towards the forcesensing beam. By using lithography to define the structures, they are aligned to allow the two gratings to interpenetrate when the separation between them is reduced. Our data shows a number of novel features, including strong deviations of the force gradient from the proximity force approximation and a nonzero, distanceindependent Casimir force over certain range of displacement.We will also discuss the design of a bridge to measure the difference in Casimir forces on two types of surfaces. By fabricating an additional sensing beam next to the original one and measuring their resonant frequency shifts simultaneously in the same experimental run, the difference in the Casimir force gradient of two different geometries can be compared.



Latest Advances on Modal Methods in Computational Electromagnetics: Applications in Nanophotonics and Plasmonics
Auteur(s): Edee Kofi, Ben rhouma Maha, Antezza M., Guizal B.
Conference: PIERS : Progress In Electromagnetics Research Symposium (Toyama, JP, 20180801)
Ref HAL: hal01863901_v1
Exporter : BibTex  endNote
Résumé: Metasurfaces are planar metamaterials that consist of a single or a few stack of subwavelength thickness metaldielectric layers. They could be periodically structured or not with subwavelength scale patterns according to the transverse directions. The strong interac tion between an electromagnetic field components and these surfaces, exhibits some properties that could not be found in nature. These artificial properties strongly depend on the shape and arrangement of the elementary patterns and they are often linked to a plasmon resonance phe nomenon. Metasurfaces working in the visible range generally consist in periodical arrangments of plasmonic resonators. These resonators are inherently mutiscale, as their responses relie on the excitation of resonances in very small gaps, like in the case of gapplasmon resonators [1] or for bowtire antennas. The simulation of their electromagnetic response can be very challeng ing and may be successfully treated thanks to a modal method holding the complexity of the patterns shape. Here we present a polynomial modal method [2–5] that is particularly suited for the simulation of metallic structures. Advanced coordinates transformation such as matched coordinates and tilted coordinates are included in order to hold efficiently the complexity of the geometry without any approximation. Such a tool even offers the possibility to control the way the resonators are periodically arranged.



Nearfield heat transfer between graphene/hBN multilayers
Auteur(s): Guizal B., Zhao Bo, Zhang Z., Fan Shanhui, Antezza M.
Conférence invité: PIERS: Progress In Electromagnetics Research Symposium (Toyama, JP, 20180801)
Ref HAL: hal01863580_v1
Exporter : BibTex  endNote
Résumé: We study the radiative heat transfer between multilayer structures made by a periodic repetition of a graphene sheet and a hexagonal boron nitride (hBN) slab. Surface plasmons in a monolayer graphene can couple with hyperbolic phonon polaritons in a single hBN film to form hybrid polaritons that can assist photon tunneling. For periodic multilayer graphene/hBN structures, the stacked metallic/dielectric array can give rise to a further effective hyperbolic behavior, in addition to the intrinsic natural hyperbolic behavior of hBN. The effective hyperbolicity can en able more hyperbolic polaritons that enhance the photon tunneling and hence the nearfield heat transfer. However, the hybrid polaritons on the surface, i.e., surface plasmonphonon polaritons, dominate the nearfield heat transfer between multilayer structures when the topmost layer is graphene. The effective hyperbolic regions can be well predicted by the effective medium theory (EMT), thought EMT fails to capture the hybrid surface polaritons and results in a heat trans fer rate much lower compared to the exact calculation. The chemical potential of the graphene sheets can be tuned through electrical gating and results in an additional modulation of the heat transfer. We found that the nearfield heat transfer between multilayer structures does not increase monotonously with the number of layers in the stack, which provides a way to control the heat transfer rate by the number of graphene layers in the multilayer structure. The results may benefit the applications of nearfield energy harvesting and radiative cooling based on hybrid polaritons in twodimensional materials.

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