Spatial distribution of optically induced atomic excitation in a dense and cold atomic ensemble

Abstract

On the basis of our general theoretical results developed previously in JETP 112, 246 (2011), we calculate the spatial distribution of atoms excited in a dense and cold atomic cloud by weak monochromatic light. We also study the atomic distribution over different Zeeman sublevels of the excited state in different parts of the cloud. The dependence of this distribution of atomic excitation on the density of the atomic ensemble and the frequency of external emission is investigated. We show that in the boundary regions of the cloud the orientation and alignment of atomic angular momentum takes place. Analysis of the spatial distribution of atomic excitation shows no noticeable signs of light localization effects even in those parameter regimes where the Ioffe-Regel criterium of strong localization is satisfied. However, comparative calculations performed in the framework of the scalar approximation to the dipole-dipole interaction reveals explicit manifestation of strong localization under some conditions.

Submitted to Physical Review A (2013). See also JETP 112, 246 (2011)

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• Finite-size scaling of the density of states inside band gaps of ideal and disordered photonic crystals
• Intensity of waves inside a strongly disordered medium
• Transport of light through a dense ensemble of cold atoms in a static electric field
• Cooperative spontaneous decay of local excitation in a dense and disordered ensemble of point-like impurity atoms near a charged conductive surface