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Article Dans Une Revue Physical Review A : Atomic, molecular, and optical physics [1990-2015] Année : 2016

Polaritonic modes in a dense cloud of cold atoms

Résumé

We analyze resonant light scattering by a cloud of cold atoms with randomly distributed positions in a regime where resonant dipole-dipole interactions between scatterers cannot be neglected. Using a microscopic approach we calculate numerically the collective eigenmodes of the cloud for many realizations. It is found that there always exists a small number of polaritonic modes. Using a macroscopic approach, we show that the atomic cloud is equivalent to a homogeneous particle with an effective permittivity and that there is a one-to-one correspondence between the microscopic polaritonic modes and the modes of the homogeneous particle.
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hal-01643446 , version 1 (21-11-2017)

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N. J Schilder, Christophe Sauvan, J.-P. Hugonin, Stephan Jennewein, Yvan R. P. Sortais, et al.. Polaritonic modes in a dense cloud of cold atoms. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2016, 93 (6), pp.063835. ⟨10.1103/PhysRevA.93.063835⟩. ⟨hal-01643446⟩
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