Université Paul Sabatier - Bat. 3R1b4 - 118 route de Narbonne 31062 Toulouse Cedex 09, France

Accueil > Événements > Séminaires 2012

Cooperative scattering of light by cold atoms

Tom Bienaimé, INLN, Nice

The problem of collective spontaneous emission has recently received growing interest with the study of single photon superradiance from N two-level atoms prepared by the absorption of one photon. Considering the decay of atoms prepared in the "timed Dicke state", strong forward emission is expected for extended systems, with a cooperative decay rate proportional to N and inversely proportional to the square of the atomic cloud size.

I will discuss our recent results on cooperative scattering by a cloud of cold atoms and will present the experiments which lead to the first observation of these effects. I will then briefly explain how subradiant states, where the energy remains partially trapped in the atomic system, can be observed and controlled in large cloud of cold atoms.

Finally, I will mention an original technique for compressing an atomic cloud which would allow us to study the interplay between disorder and cooperativity in the dense regime of light-mater interaction (distance between two atoms wavelength).