Surface plasmons and strong light-matter coupling in metallic nanostructures

Interaction between a radiating dipole and light can be effectively enhanced due to the excitation of surface plasmons at metal-dielectric interfaces. Such an enhancement can trigger the appearance of strong-coupling effects in light-matter interaction, e.g., vacuum Rabi splitting in the emission spectrum of the dipole. We present a theoretical study of the transition to the strong-coupling regime for a radiating dipole in proximity of some metallic nanostructures of experimental interest, notably nanoshells and nanocones. Our formalism is applicable to both fully analytical and numerical approaches.