Coherent transport of nanowire surface plasmons coupled to quantum dots.
The coherent transport of surface plasmons with nonlinear dispersion relations on a metal nanowire coupled to two-level emitters is investigated theoretically. Real-space Hamiltonians are used to obtain the transmission and reflection spectra of the surface plasmons. For the single-dot case, we find that the scattering spectra can show completely different features due to the non-linear quadratic dispersion relation. For the double-dot case, we obtain the interference behavior in transmission and reflection spectra, similar to that in resonant tunneling through a double-barrier potential. Moreover, Fano-like line shape of the transmission spectrum is obtained due to the quadratic dispersion relation. All these peculiar behaviors indicate that the dot-nanowire system provides a onedimensional platform to demonstrate the bandgap feature widely observed in photonic crystals.
Chen
Wei
W
Department of Physics and National Center for Theoretical Sciences, National Cheng-KungUniversity, Tainan 701, Taiwan.
Chen
Guang-Yin
GY
Chen
Yueh-Nan
YN
D003198:Computer Simulation; D008027:Light; D008962:Models, Theoretical; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D045663:Quantum Dots; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000379:methods*