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(67) Production(s) de FELBACQ D.


Impedance operator description of a meta–surface with electric and magnetic dipoles
Auteur(s): Felbacq D.
(Document sans référence bibliographique)
Ref HAL: hal01182196_v1
Résumé: A metasurface made of a collection of nanoresonators characterized an electric dipole and a magnetic dipole was studied in the regime where the wavelength is large with respect to the size of the resonators. An effective description in terms of an impedance operator was derived.
Commentaires: Article invité pour Mathematical Problems in Engineering




Measuring enhanced optical correlations induced by transmission open channels in a slab geometry
Auteur(s): Verrier N., Depreater L, Felbacq D., Gross M.
(Document sans référence bibliographique) 20150731
Ref HAL: hal01181347_v2
Ref Arxiv: 1507.08399
Ref. & Cit.: NASA ADS
Résumé: Light can be transmitted through disordered media with high efficiency due to the existence of open channels, but quantitative agreement with theory is difficult to obtain because of the large number of channels to control. By measuring, by digital holography, the correlations of the transmitted field, we are able to determine the number of channels involved in transmission. With sample, the number of channels is divided by about 15 with respect to what is expected without sample. This figure is in good agreement with the theoretical prediction.




Ray Chaos in a Photonic Crystal
Auteur(s): Rousseau E., Felbacq D.
(Document sans référence bibliographique)
Ref HAL: hal01095319_v1
Ref Arxiv: 1412.4772
Ref. & Cit.: NASA ADS
Résumé: The ray dynamics in a photonic crystal was investigated. Chaos occurs for perfectly periodic crystals, the rays dynamics being very sensitive to the initial conditions. Depending on the filling factor, the ray dynamics can exhibit stable paths near (fully) chaotic motion. The degree of chaoticity is quantified through the computation of Lyapunov exponents. It results that the more diluted is the geometry, the more chaotic is the dynamic. Therefore, despite the perfect periodicity of the geometry, light transport is a diffusive process which can be tuned from normal diffusion (brownian motion) to anomalous diffusion because of the existence of Lévy flights.




Weak and strong coupling of a quantum emitter with a meta–surface
Auteur(s): Felbacq D.
(Document sans référence bibliographique)
Ref HAL: hal01086129_v1
Ref Arxiv: 1411.6373
Ref. & Cit.: NASA ADS
Résumé: Meta–surfaces are the bidimensional analogue of metamaterials. They are made on resonant elements periodically disposed on a surface. They have the ability of controlling the polarization of light and to generalized refraction laws as well. They have also been used to enhance the generation of the second harmonic. It seems however that their nearfield properties have not been investigated. In this work, the coupling of an emitter with a meta– surface made of a periodic set of resonant linear dipoles was studied. Bloch surface modes localized on the meta–surface exist due the resonance of the dipoles. The strong coupling regime with a emitter can be reached when the Bohr frequency of the emitter is in resonance with the Bloch modes of the metasurface.




Chaos and Diffusion in periodic structures
Auteur(s): Rousseau E., Felbacq D., Cassabois G.
Conférence invité: International Workshop on the Physics of Excitons (Varadero, CU, 20130330)
Résumé: For some conditions, we show that light propagation in perfectly periodic structures can be chaotic. Then we show that light motion is then better described by a diffusion process. We also show that the meansquare distance increase faster than linearly with time characterizing a superdiffusion process.



Spatial dispersion effects in the lowfrequency behavior of metamaterials
Auteur(s): Felbacq D.
Conférence invité: Days on Diffraction (SaintPetersbourg, RU, 20130526)
Ref HAL: hal00807704_v1
Résumé: The collective behavior of resonant scatterers is investigated in the low frequency regime. Evidences of a strong spatial dispersion are given.



Strong coupling between photons and plasmonpolaritons
Auteur(s): Felbacq D., Castanie A., Guizal B.
Conférence invité: International Conference on Transparent Networks (, ES, 20130623)
Résumé: We study the
effect of confinement on surface plasmons in a planar cavity with a wall coated with a lossy
metal as well as with two walls coated with a lossy metal. The dispersion curves are studied
in details and explicit relations are obtained locally for the first case. It is shown that modes
strongly concentrated at the airmetal interface can be obtained. Finally, we discuss the modes
of the lossy waveguide, in particular their completeness.
