Abstract
In this paper, we present a modified slot surface plasmonic waveguide
formed by metallic rod, core dielectric layer, and metallic film on the
substrate. Using the finite-difference frequency-domain method, modal field
distribution are analyzed firstly. Results show that the fundamental mode
could be well confined in the space between the metal rod and the metal
film. The dependence of modal field distribution, effective index, and
propagation length of the fundamental plasmonic mode without gain on
dielectric constant of the core layer, geometrical parameters, and working
wavelengths are analyzed and discussed. A kind of available gain dielectric
medium was used for the core dielectric layer to extend the propagation
length. Results show that the propagation length can be extended observably
with the help of the gain dielectric medium. Finally, effect of the
thickness of the core dielectric layer on modal field distribution,
effective index, and propagation length are analyzed and discussed. Since
the modal field distribution, effective index, and propagation length can be
controlled by adjusting the geometrical parameters, dielectric constant and
gain of the core layer and working wavelengths of the waveguide, this kind
of surface plasmonic waveguide can be applied to the field of photonic
device integration and sensors.
© 2009 IEEE
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