Open AccessPlasmon excitation by the Gaussian-like core mode of a photonic crystal waveguide
Author(s) -
Maksim Skorobogatiy,
Andrei V. Kabashin
Publication year - 2006
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.14.008419
Subject(s) - optics , waveguide , plasmon , materials science , photonic crystal , optoelectronics , refractive index , radiation mode , core (optical fiber) , surface plasmon , single mode optical fiber , physics , optical fiber
We describe resonant excitation of a plasmon by the Gaussian-like leaky mode of an effectively single mode photonic crystal (PC) waveguide. Plasmon is phase matched by design with a waveguide mode, and travels in a metallic layer on the top of a PC waveguide. We observe that small changes in the ambient refractive index just outside the metal film lead to strong variations in the losses of a waveguide core mode, making such a device a good candidate for compact sensor applications. Using low refractive index core PC waveguides makes phase matching between the plasmon and PC core mode relatively easy to enforce as modal effective index in such waveguides can be readily varied in a wide range.