Fabry-Perot Effect on Dimer Nanoantennas

In this work, we investigate the interaction between a single quantum emitter and dimer nanoantennas through a Fabry–Perot structure composed of an appropriate combination of two dielectric layers. This type of dielectric configuration is well knownin the microwave region to increase the antenna performance, such as directivity, radiation efficiency, and radiation resistance. Here,the Fabry–Perot concept is transposed to the optical domain. The single emitter couples to the antenna through the dielectricstructure, giving rise to a wide aperture field on top of the dielectrics with the same polarization of the emitter. This purely polarizedaperture field can be used to excite one or more conveniently spaced nanoantennas. We demonstrate by 3D numerical calculationsthat the directivity and excitation rate of a single dimer is highly increased. Also, we show that multiple dimers arranged in an arrayconfiguration can be enhanced due to the wide aperture field generated by a single emitter