Resonance Fluorescence of Many Interacting Adatoms at a Metal Surface
Recently there has been considerable theoretical and experimental interest in the interaction of electromagnetic radiation with surfaces. The perfection of the fatty-acid monolayer assembly technique has led to a series of experiments in which the fluorescence of an excited atom or molecule at a fixed distance from a metal surface (gold, silver and cooper) was measured.1 Experiments have also demonstrated enhanced luminescence and resonance fluorescence for adspecies on metals (and also on dielectric fibers) as compared to the surface-free molecules.2,3 In order to understand the excitation-relaxation behavior and resonance fluorescence spectrum of a laser-driven atom near a metal surface, we choose in this paper a simple two-level model for the adatom, combined with the techniques of quantum optics. We shall first review the model for a single adatom and then extend it to many interacting adatoms.
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