Physics – Quantum Physics
Scientific paper
2000-09-13
Phys. Rev. A 63, 053811 (2001)
Physics
Quantum Physics
10 pages, RevTex, 4 eps figures
Scientific paper
The decay rate and the classical radiation power of an excited molecule (atom) located in the center of a dispersive and absorbing dielectric sphere taken as a simple model of a cavity are calculated adopting the Onsager model for the local field. The local-field correction factor to the external (radiation and absorption) power loss of the molecule is found to be $|3\epsilon(\omega)/[3\epsilon(\omega)+1]|^2$, with $\epsilon(\omega)$ being the dielectric function of the sphere. However, local-field corrections to the total decay rate (power loss) of the molecule are found to be much more complex, including those to the decay rate in the infinite cavity medium, as derived very recently by Scheel et al. [Rev. A 60, 4094 (1999)], and similiar corrections to the cavity-induced decay rate. The results obtained can be cast into model-independent forms. This suggests the general results for the local-field corrections to the decay rate and to the external power loss of a molecule in an absorbing cavity valid for molecule positions away from the cavity walls.
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