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(61) Production(s) de FELBACQ D.
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Spatial dispersion effects in the low-frequency behavior of metamaterials 
Auteur(s): FELBACQ D.
Conférence invité: Days on Diffraction (Saint-Petersbourg, RU, 2013-05-26)
Ref HAL: hal-00807704_v1
Résumé: The collective behavior of resonant scatterers is investigated in the low frequency regime. Evidences of a strong spatial dispersion are given.
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Strong coupling between photons and plasmon-polaritons
Auteur(s): FELBACQ D., CASTANIE A., GUIZAL B.
Conférence invité: International Conference on Transparent Networks (, ES, 2013-06-23)
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 air-metal interface can be obtained. Finally, we discuss the modes
of the lossy waveguide, in particular their completeness.
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Wave propagation in resonant photonic glasses
Auteur(s): FELBACQ D.
Conférence invité: Journées Neptune (Toulon, FR, 2013-04-09)
Résumé: We propose a space dependent homogenization scheme for a 2D media made of resonant scatterers.
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Quantum systems in a stationary environment out of thermal equilibrium
Auteur(s): BELLOMO B., Messina R., FELBACQ D., ANTEZZA M.
(Article) Publié:
Physical Review A: Atomic, Molecular and Optical Physics, vol. 87 p.012101 (2013)
DOI: 10.1103/PhysRevA.87.012101
Résumé: We discuss how the thermalization of an elementary quantum system is modified when the system is placed
in an environment out of thermal equilibrium. To this aim we provide a detailed investigation of the dynamics
of an atomic system placed close to a body of arbitrary geometry and dielectric permittivity, whose temperature
T_M is different from that of the surrounding walls T_W. A suitable master equation for the general case of an
N-level atom is first derived and then specialized to the cases of a two- and three-level atom. Transition rates
and steady states are explicitly expressed as a function of the scattering matrices of the body and become both
qualitatively and quantitatively different from the case of radiation at thermal equilibrium. Out of equilibrium,
the system steady state depends on the system-body distance, on the geometry of the body, and on the interplay
of all such parameters with the body optical resonances. While a two-level atom tends toward a thermal state,
this is not the case already in the presence of three atomic levels. This peculiar behavior can be exploited, for
example, to invert the populations ordering and to provide an efficient cooling mechanism for the internal state
of the quantum system.We finally provide numerical studies and asymptotic expressions when the body is a slab
of finite thickness. Our predictions can be relevant for a wide class of experimental configurations out of thermal
equilibrium involving different physical realizations of two- or three-level systems.
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Transport in Metamaterails, Light Localisation and transport in dielectric metamaterails
Auteur(s): GUIZAL B., FELBACQ D., Zolla Frederic
Conférence invité: International Conference On Computational and Experimental Engineering and Sciences, (ICCES'12) (Crete, GR, 2012-04-30)
Ref HAL: hal-00813434_v1
Résumé: Light transport in two-dimensional disordered metamaterials made of high-permittivity rods is studied theoretically. Different regimes of transport are observed and explained in terms of coupled electric and magnetic dipolar resonances. A very general homogenization theory is derived. Light propagation at frequencies close to the magnetic dipole resonance is investigated at the microscopic level and is shown to rely on hybrid, necklace-like, states. The stability of these results versus the permittivity and disorder are investigated.
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, FELBACQ D., CASSABOIS G.