Metal gap optical waveguides support propagation and strong confinement of coupled surface plasmon polariton in nano-region. We study efficient transmission through a plasmonic T-branch with a mesa structure in metal gap optical waveguides. Transmissivity through the branch with various mesa geometries is investigated by numerical simulations. It is found that transmissivity through the branch can be improved by introducing thin metal barrier into dielectric gap. We can achieve more than four times enhancement in the transmissivity.

Date Published: 28 August 2008
PDF: 8 pages
Proc. SPIE 7033, Plasmonics: Nanoimaging, Nanofabrication, and Their Applications IV, 70330Y (28 August 2008); doi: 10.1117/12.794531

Published in SPIE Proceedings Vol. 7033:
Plasmonics: Nanoimaging, Nanofabrication, and Their Applications IV
Satoshi Kawata; Vladimir M. Shalaev; Din Ping Tsai, Editor(s)