Coherent Controllable Transport of a Surface Plasmon Coupled to   Plasmonic Waveguide with a Metal Nano Particle-Semiconductor Quantum Dot   Hybrid System
  By using the real-space method, switching of a single plasmon interacting with a hybrid nanosystem composed of a semiconductor quantum dot (SQD) and a metallic nanoparticle (MNP) coupled to one-dimensional surface plasmonic waveguide is investigated theoretically. We discussed that the dipole coupling between an exciton and a localized surface plasmon results in the formation of a hybrid exciton and the transmission and reflection of the propagating single plasmon could be controlled by changing the interparticle distance between the SQD and the MNP and the size of the nanoparticles. The controllable transport of the propagating single surface plasmon by such a nanosystem discussed here could find the significant potential in the design of next-generation quantum devices such as plasmonic switch, single photon transistor and nanolaser and quantum information. 
Myong-Chol Ko, Nam-Chol Kim, Zhong-Hua Hao, Li Zhou, Jian-Bo Li, and   Qu-Quan Wang
cond-mat.mes-hall physics.optics