Abstract
The propagation characteristics of surface plasmon polariton modes in
metal-strip plasmonic waveguides with gyrotropic (magneto-optic) substrate
material has been numerically studied. The method of line formalism has been
adopted for computing the dispersion of fundamental symmetric and
antisymmetric modes supported by the structure. The magneto-optic substrate
has been chosen such that the resulting propagating modes exhibit
nonreciprocal dispersion, enabling their application in many optical
devices. Fundamental pair modes of surface plasmon polaritons supported by
metal strips, which have degeneracy properties with isotropic dielectric
substrates, have been found to be nondegenerate in our case. These modes
show different trends in the dispersion with variation of metal film
thickness, compared to that in an asymmetric strip waveguide with isotropic
substrate. A nonreciprocal phase shift of
0.5–14rad/mm is achievable for antisymmetric modes
that are localized near the gyrotropic interface.
© 2011 IEEE
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