Eur. Phys. J. D 32, 195-200 (2005)
https://doi.org/10.1140/epjd/e2005-00019-7

Vacuum-field atom trapping in a wide aperture spherical resonator

Laboratoire Charles Fabry de l'Institut d'Optique, 91403 Orsay Cedex, France

Corresponding author: ^a philippe.grangier@iota.u-psud.fr

Received: 26 July 2004
Revised: 4 January 2005
Published online: 9 February 2005

Abstract

We consider the situation where a two-level atom is placed in the vicinity of the center of a spherical cavity with a large numerical aperture. The vacuum field at the center of the cavity is actually equivalent to the one obtained in a microcavity, and both the dissipative and the reactive parts of the atom's spontaneous emission are significantly modified. Using an explicit calculation of the spatial dependence of the radiative relaxation rate and of the associated level shift, we show that for a weakly excitating light field, the atom can be attracted to the center of the cavity by vacuum-induced light shifts.