interparticle coupling effects of two quantum dots system on the transport properties of a single plasmon

Transport properties of a single plasmon interacting with two quantum dots (qds) system coupled to one-dimensional surface plasmonic waveguide are investigated theoretically via the real-space approach. we mainly focus on the coupling effects of the two qds on the transmission properties of a single incident plasmon. we demonstrated that switching of a single plasmon can be achieved by controlling the interparticle distance, the interparticle coupling strength, and the qd-waveguide coupling strength, as well as spectral detuning. we also showed that the coupling between the continuum excitations and the discrete excitations results in the fano-type transmission spectrum. the transport properties of a single plasmon interacting with such a two direct coupled qds system could find the applications in the design of plasmonic nanodevices, such as single photon switching and nanomirrors, and in quantum information processing.