Coherent plasmon transport using a quantum dot coupled plasmonic nanocavity system

The transport property of surface plasmon polariton in an Ag nanowire-polymethylmethacrylate (PMMA)-Ag film waveguide structure coupled with a quantum dot (QD) is investigated theoretically. By placing a two-level QD into the plasmonic Fabry–Perot (FP) nanocavity, which is formed by two distributed Bragg reflectors (DBRs) patterned in the PMMA layer, a sharp asymmetric Fano line shape can be obtained in the transmission spectrum. We analyze this phenomenon theoretically using the transfer matrix method. The line shape is very sharp, and the required frequency shift from the minimum to maximum transmission is quite small. This will have great potential applications in single-photon modulation and switching in integrated nanophotonic circuitry.