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(44) Production(s) de ANTEZZA M.


CasimirLifshitz force for nonreciprocal media and applications to photonic topological insulators
Auteur(s): Fuchs Sebastian, Lindel Frider, Krems Roman, Hanson George w., Antezza M., Buhmann Stefan yoshi
(Article) Publié:
Physical Review A: Atomic, Molecular And Optical Physics, vol. 96 p.062505 (2017)
Ref HAL: hal01664518_v1
DOI: 10.1103/PhysRevA.96.062505
Exporter : BibTex  endNote
Résumé: Based on the theory of macroscopic quantum electrodynamics, we generalize the expression of the Casimir force for nonreciprocal media. The essential ingredient of this result is the Green’s tensor between two nonreciprocal semiinfinite slabs, including a reflexion matrix with four coefficients that mixes optical polarizations. This Green’s tensor does not obey Lorentz’s reciprocity and thus violates timereversal symmetry. The general result for the Casimir force is analyzed in the retarded and nonretarded limits, concentrating on the influences arising from reflections with or without change of polarization. In a second step, we apply our general result to a photonic topological insulator whose nonreciprocity stems from an anisotropic permittivity tensor, namely InSb. We show that there is a regime for the distance between the slabs where the magnitude of the Casimir force is tunable by an external magnetic field. Furthermore, the strength of this tuning depends on the orientation of the magnetic field with respect to the slab surfaces.



Giant Interatomic EnergyTransport Amplification with Nonreciprocal Photonic Topological Insulators
Auteur(s): Doyeux P., Hassani gangaraj S. ali, Hanson George w., Antezza M.
(Article) Publié:
Physical Review Letters, vol. 119 p.173901 (2017)
Ref HAL: hal01624891_v1
DOI: 10.1103/PhysRevLett.119.173901
Exporter : BibTex  endNote
Résumé: We show that the energytransport efficiency in a chain of twolevel emitters can be drastically enhanced by the presence of a photonic topological insulator (PTI). This is obtained by exploiting the peculiar properties of its nonreciprocal surface plasmon polariton (SPP), which is unidirectional, and immune to backscattering, and propagates in the bulk band gap. This amplification of transport efficiency can be as much as 2 orders of magnitude with respect to reciprocal SPPs. Moreover, we demonstrate that despite the presence of considerable imperfections at the interface of the PTI, the efficiency of the SPPassisted energy transport is almost unaffected by discontinuities. We also show that the SPP properties allow energy transport over considerably much larger distances than in the reciprocal case, and we point out aparticularly simple way to tune the transport. Finally, we analyze the specific case of a twoemitter chain and unveil the origin of the efficiency amplification. The efficiency amplification and the practical advantages highlighted in this work might be particularly useful in the development of new devices intended to manage energy at the atomic scale.



Radiative heattransfer between metallic gratings using adaptive spatial resolution
Auteur(s): Messina R., Noto A., Guizal B., Antezza M.
Conférence invité: META'17  Incheon – Korea (Incheon  Seoul, KR, 20170725)
Ref HAL: hal01570566_v1
Exporter : BibTex  endNote
Résumé: We calculate the radiative heat transfer between two metallic gratings by exploiting the Adaptive Spatial Resolution metod. This technique dramatically improves the rate of convergence allowing to explore smaller separations. The heat flux shows a remarkable amplification of the exchanged energy, due to spoofplasmon modes. We find a consistent disagreement with some previously obtained results going up to 50% (this disagreement is explained in terms of an incorrect connection between the reflection operators of the two gratings).



Graphenebased amplification and tuning of nearfield radiative heat transfer between dissimilar polar materials
Auteur(s): Messina R., BenAbdallah Philippe, Guizal B., Antezza M.
(Article) Publié:
Physical Review B, vol. 96 p.045402 (2017)
Ref HAL: hal01557223_v1
DOI: 10.1103/PhysRevB.96.045402
Exporter : BibTex  endNote
Résumé: The radiative heat transfer between two dielectrics can be strongly enhanced in the near field in the presence of surface phononpolariton resonances. Nevertheless, the spectral mismatch between the surface modes supported by two dissimilar materials is responsible for a dramatic reduction of the radiative heat flux they exchange. In the present paper we study how the presence of a graphene sheet, deposited on the material supporting the surfacewave of lowest frequency, allows us to widely tune the radiative heat transfer, producing an amplification factor going up to one order of magnitude. By analyzing the Landauer energy transmission coefficients we demonstratethat this amplification results from the interplay between the delocalized plasmon supported by graphene and the surface polaritons of the two dielectrics. We finally show that the effect we highlight is robust with respect to the frequency mismatch, paving the way to an active tuning and amplification of nearfield radiative heat transfer in different configurations.



Nearfield heat transfer between graphene/hBN multilayers
Auteur(s): Zhao Bo, Guizal B., Zhang Zhuomin, Fan Shanhui, Antezza M.
(Article) Publié:
Physical Review B, vol. 95 p.245437 (2017)
Ref HAL: hal01552158_v1
DOI: 10.1103/PhysRevB.95.245437
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 withhyperbolic 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 enable more hyperbolic polaritons that enhance the photon tunneling and hence the nearfieldheat 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 effectivehyperbolic 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 transfer 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.



ThermalandElectrostaticManipulationoftheCasimirForceinGrapheneMultilayers
Auteur(s): Guizal B., Abbas C., Antezza M.
Conférence invité: Global summit on Laser Optics & Photonics (Valencia, ES, 20170619)
Ref HAL: hal01548335_v1
Exporter : BibTex  endNote
Résumé: We show that graphenedielectric multilayers give rise to an unusual tunability of the CasimirLifshitz forces and allow to easily realize completely different regimes within the same structure. Concerning thermal effects, graphenedielectric multilayers take advantage of the anomalous features predicted for isolated suspended graphene sheets, even though they are considerably affected by the presence of the dielectric substrate. They can also achieve the anomalous nonmonotonic thermal metallic behavior by increasing the graphene sheets density and their Fermi level. In addition to a strong thermal modulation occurring at short separations, in a region where the force is orders of magnitude larger than the one occurring at large distances, the force can be also adjusted by varying the number of graphene layers as well as their Fermi levels, allowing for relevant force amplifications which can be tuned, very rapidly and in situ, by simply applying an electric potential. Our predictions can be relevant for both Casimir experiments and micro or nanoelectromechanical systems and in new devices for technological applications.



Radiative Heat Transfer between Metallic Gratings Using Adaptive Spatial Resolution
Auteur(s): Guizal B., Messina R., Noto A., Antezza M.
Conférence invité: PIERS : Progress In Electromagnetics Research Symposium (Saint Petersbourg, RU, 20170522)
Ref HAL: hal01538779_v1
Exporter : BibTex  endNote
Résumé: We calculate the radiative heat transfer between two identical metallic onedimensional lamellar gratings. To this aim we present and exploit a modification to the widelyused Fourier modal method, known as adaptive spatial resolution, based on a stretch of the coordinate associated to the periodicity of the grating. We first show that this technique dramatically improves the rate of convergence when calculating the heat flux. We then present a study of heat flux as a function of the grating height, highlighting a remarkable amplification of the exchanged energy, ascribed to the appearance of spoofplasmon modes, whose behavior is also spectrally investigated. Differ ently from previous works, our method allows us to explore a range of grating heights extending over several orders of magnitude. By comparing our results to recent studies we find a consis tent quantitative disagreement with some previously obtained results going up to 50%. In some cases, this disagreement is explained in terms of an incorrect connection between the reflection operators of the two gratings.
