SPONTANEOUS DECAY RATE AND LEVEL SHIFT OF A TWO-LEVEL ATOM IN THE PRESENCE OF A MULTILAYERED-CYLINDRICAL WAVEGUIDE

Abstract

We consider the spontaneous decay rate of a two-level excited atom positioned on axis of a multilayered-cylindrical waveguide. Three types of configuration are studied including a three-layer and a four-layer Drude-Lorentz type, Lorentz-bandgap type, and a Bragg-distributed mirror type. It is shown that if the atomic transition frequency falls within the bandgap of the medium filling the wall of the resonator, the atom can be trapped in the excited state. Besides, the decay rate is strongly enhanced near the edge of the bandgap. The Lamb shift is also considered.