Doubly and Triply Coupled Nanowire Antennas

Abstract

Nanoantenna is one of the most important optical components for light harvesting. In this study, we show experimental evidence of interactions between coupled nanowires by comparing the fluorescence properties of quantum dots on single nanowire as well as doubly and triply coupled nanowire arrays. Because of the localized surface plasmon mode, there are strong polarization dependences in this photon–plasmon–exciton conversion process. It is interesting that both the polarization-dependent enhancement and the degree of fluorescence polarization are more pronounced for triply coupled nanowires than that of doubly coupled nanowire, while the case of single nanowire is weakest. Our theoretical analysis indicates the above phenomena can be ascribed to the coupled plasmon from the nanowire antennas. Our investigations demonstrate a potential method to control the polarization of emitters using coupled nanowire arrays