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Modifications in the spontaneous emission rate of an excited atom that arecaused by extinction effects in a nearby dielectric medium are analyzed in aquantummechanical model, in which the medium consists of spherical scattererswith absorptive properties. Use of the dyadic Green function of theelectromagnetic field near a a dielectric sphere leads to an expression for thechange in the emission rate as a series of multipole contributions for whichanalytical formulas are obtained. The results for the modified emission rate asa function of the distance between the excited atom and the dielectric mediumshow the influence of both absorption and scattering processes.

Quantized Media with Absorptive Scatterers and Modified Atomic Emission Rates