Abstract
In this paper, the hybrid coupling between long-range surface plasmon
polariton (LRSPP) waveguide mode and dielectric waveguide mode has been studied
theoretically and experimentally in detail by considering its dependence on
the structure parameters and wavelength. It is demonstrated that extremely
high coupling efficiency $({
> } 99\hbox{\%})$ has been achieved for TM polarization, while
no coupling could happen for TE polarization between these two kinds of waveguides.
Based on this hybrid coupler, a polarization splitter with pure TM-mode output
from one arm and TE-mode output from the other arm with high TE/TM extinction
ratio has been realized. Additionally, this kind of coupling between different
waveguides is very significant for providing an effective approach to connect
the LRSPP-based devices with the conventional dielectric devices.
© 2011 IEEE
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