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Classical interaction of the electromagnetic radiation with two-level polarizable matter

Marian Apostol

Published Jul 14, 2011• 0 citations
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DOI
10.1016/j.ijleo.2010.10.053

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We present a semi classical model for studying the fluorescent power radiated by an atom placed at the interstices between polarizable particles with dimensions at the nanometer scale irradiated by a laser with frequency close to resonance. The atom is represented by a two-level quantum system and for the electromagnetic response of the surrounding particles a model based on their multipolar polarizability is used. Results are shown for the case of an atom in between two spherical particles forming a cluster, giving the fluorescent power of the atom as a function of the distance to the spheres and also of the laser frequency and intensity.
At densities that are typical of condensed matter, a propagating electromagnetic field mediates interactions between polarizable constituents of a material in what is known as the local-field effect. Previous investigations of the local-field effect have been limited to a single polarizable component of a nonlinear material. For multicomponent media, we have found that the interaction of laser radiation with an optically nonlinear component of condensed matter is fundamentally altered by the presence of another polarizable component as a result of the local-field effect. Novel effects include local-field enhancement effects, local cooperative decays, and coherence transfer and coherence exchange processes.© (1997) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.