Abstract
The accurate Legendre pseudospectral time-domain (PSTD)
method is applied in this paper to the study of optical behaviors of 2-D dielectric
and plasmonic waveguide-coupled ring resonators. Based on its inherent multidomain
scheme with curvilinear-quadrilateral subdomain partitioning, the PSTD method
possesses superior advantage in fulfilling field continuity conditions across
material interfaces, which provides better numerical handling upon circular
or even more complicated ring structures. Accordingly, investigations of several
plasmonic nanoring resonators of different shapes with surface plasmon polariton
(SPP) waves propagating on the metal/dielectric/metal waveguides are made
with the aids of a well-fitted Drude–Lorentz material-dispersion model
through analyzing their characteristics in the near-infrared and visible parts
of the light spectrum. Especially, the racetrack-shaped ring is carefully
designed with optimized track length to avoid the over- or under-coupling
problem between the ring and input waveguides and, thus, achieve excellent
spectral performance.
© 2012 IEEE
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