Physics – Quantum Physics
Scientific paper
2006-05-10
Physical Review A 74 (2), 023803 (2006)
Physics
Quantum Physics
12 pages, 6 figures, minor additions
Scientific paper
10.1103/PhysRevA.74.023803
The influence of the size and shape of a dispersing and absorbing dielectric body on the local-field corrected spontaneous-decay of an excited atom embedded in the body is studied on the basis of the real-cavity model. By means of a Born expansion of the Green tensor of the system it is shown that to linear order in the susceptibility of the body the decay rate exactly follows Tomas's formula found for the special case of an atom at the center of a homogeneous dielectric sphere [Phys. Rev. A 63, 053811 (2001)]. It is further shown that for an atom situated at the interior of an arbitrary dielectric body this formula remains valid beyond the linear order. The case of an atom embedded in a weakly polarizable sphere is discussed in detail.
Buhmann Stefan Yoshi
Dung Ho Trung
Welsch Dirk-Gunnar
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