Surface plasmon coupling with a radiating dipole near a Ag nanoparticle embedded in GaN

Abstract

The localized surface plasmon (LSP) coupling behaviors of a radiating dipole with a Ag nanosphere (NS) embedded in GaN are evaluated based on a numerical algorithm, which takes account of the induction of the LSP resonance on the Ag NS by the radiating dipole and the feedback of the LSP resonance to the radiating behavior of the dipole. In particular, we compute the enhancements of dipole strength and radiated power through such a coupling process for the radiating dipoles oriented along the radial and orbital directions with respect to the Ag NS. The enhancements of radiated power of a radial and an orbital dipole are induced through the coupling with the LSP dipole and higher-order resonance, respectively. These results are interpreted with the interference behaviors between the radiations of the source dipole and the LSP mode of the Ag NS.