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arXiv:physics/0703046 · Physical Review A

Spontaneous emission of an atom placed near a nanobelt of elliptical cross section

Dmitry V. Guzatov, В. В. Климов

Published May 30, 2007• 10 citations
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Abstract

Spontaneous emission of an atom (molecule) placed near a nanocylinder of elliptical cross section of an arbitrary composition is studied. The analytical expressions have been obtained for the radiative and nonradiative rates of spontaneous decay and investigated in details.
DOI
10.1103/physreva.75.052901

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The spontaneous decay rate of an excited atom placed near a dielectric cylinder is investigated. Special attention is paid to the case when the cylinder radius is small in comparison with radiation wavelength (nanofiber or photonic wire). In this case, the analytical expressions of the transition rates for different orientations of a dipole are derived. It is shown that the main contribution to decay rates is due to the quasistatic interaction of the atom dipole momentum with the nanofiber, and the contributions of guided modes are exponentially small. On the contrary, in the case when the radius of the fiber is only slightly less than the radiation wavelength, the influence of guided modes can be substantial. The results obtained are compared with the case of a dielectric nanospheroid and an ideally conducting wire.