Activity of Surface Plasmon in the Ring-Like Microcavities

초록

The surface plasmon polariton (SPP) modes formation in the structure consisting from metallic torus and a metallic flat surface separated by dielectric medium, as well as in ring type V-groove cavity are considered theoretically. The results obtained for these two structures are compared. The energy of the wave field is mainly concentrated in the dielectric medium at the vicinity of the minimum thickness of the gap between the metallic surfaces. The dependence of the resonant frequency on parameters of the structure was determined. The strongly localized SPP mode in the transverse direction contributes to the increase in the Purcell factor that is crucial for enhancement of the spontaneous emission rate.

키워드