Cooperative effects of two optical dipole antennas coupled to plasmonic Fabry–Pérot cavity

Abstract

We investigate the cooperative effects of two optical dipole antennas that are coupled to a finite Au nanowire acting as plasmonic Fabry–Pérot (F–P) cavity. The coherent coupling between one single antenna and the F–P cavity can result in Fano resonance, and the coupling strength is antenna position dependent. For two antennas coupled to the F–P cavity, constructive or destructive interference between antennas could be achieved by adjusting their positions along the F–P cavity. Consequently, the Fano resonance will become stronger or weaker correspondingly.