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Prof. Nicola Piovella

Physics Dept., Università di Milano

Friday, July 13th, 2012 at 11:00:00 AM  

Conference room Querzoli - LENS - via Nello Carrara 1 - Sesto Fiorentino (Florence)

Published on-line at 11:27:35 AM on Monday, July 9th, 2012

Cooperative scattering by cold atoms in free space: theory and experiments

Recent results on cooperative light scattering by a cloud of cold two-level atoms driven by a quasi-resonant laser beam.

We present some recent results on cooperative light scattering by a cloud of cold two-level atoms driven by a quasi-resonant laser beam. Cooperativity manifests itself when the re-emitted radiation induces correlations between atoms. The light scattering diagram and the radiation pressure force acting on center of mass of the cloud have been calculated and measured on cold Rb clouds.

We also describe Mie scattering in cold atomic clouds. In fact, when a coarse-grained description for the atomic density is adopted, many of the cloud scattering properties are captured by the definition of an effective refractive index, which in turn allows for the use of the classical Mie solution for dielectric media. We study the presence of Mie resonances in atomic clouds, where the smoothness of the densities prevents some modes to propagate, and shows how patterns of atomic recoils allow to extract information on the light scattering.

For further informations, please contact Prof. Francesco Saverio Cataliotti.