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Spontaneous decay of an excited atom near a dispersing and absorbingmicrosphere of given complex permittivity that satisfies the Kramers-Kronigrelations is studied, with special emphasis on a Drude-Lorentz permittivity.Both the whispering gallery field resonances below the band gap (for adielectric sphere) and the surface-guided field resonances inside the gap (fora dielectric or a metallic sphere) are considered. Since the decay rate mimicsthe spectral density of the sphere-assisted ground-state fluctuation of theradiation field, the strengths and widths of the field resonances essentiallydetermine the feasible enhancement of spontaneous decay. In particular, strongenhancement can be observed for transition frequencies within the interval inwhich the surface-guided field resonances strongly overlap. When materialabsorption becomes significant, then the highly structured emission patternthat can be observed when radiative losses dominate reduces to that of astrongly absorbing mirror. Accordingly, nonradiative decay becomes dominant. Inparticular, if the distance between the atom and the surface of the microsphereis small enough, the decay becomes purely nonradiative.Comment: 18 pages, 15 figures, REVTE

Decay of an excited atom near an absorbing microsphere