Near-Resonant Light Scattering by a Subwavelength Ensemble of Identical Atoms

Come and join our journal club! Each week we present and discuss publications out of the world of atomic, molecular and optical (AMO) physics. Topics are of experimental and theoretical relevance.

This week: "Near-Resonant Light Scattering by a Subwavelength Ensemble of Identical Atoms"

We study theoretically the scattering of light by an ensemble of N resonant atoms in a sub-wavelength volume. We consider the low intensity regime so that each atom responds linearly to the field. While N non-interacting atoms would scatter N2 more than a single atom, we find that N interacting atoms scatter less than a single atom near resonance. In addition, the scattered power presents strong fluctuations, either from one realization to another or when varying the excitation frequency. We analyze this counter-intuitive behavior in terms of collective modes resulting from the light-induced dipole-dipole interactions. We find that for small samples, their properties are governed only by their volume when N≳20.

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Online Wednesday, August 5, 2020, 12:00. Online