Efficiently coupling single photon source to plasmonic nanoslot waveguide by nanoantenna

We numerically investigate the coupling between single-photon source to a plasmonic nanoslot waveguide. The results show that the introduction of nanoantenna element significantly improves the coupling efficiency (~35%). It is roughly 17.5 times that achieved without optical antenna. Our work demonstrates the feasibility to realize fully on-chip plasmonic-semiconductor circuits for quantum photonics.