Abstract
Asymmetric slot waveguides with a magnetooptic material filling the
slot are studied for their nonreciprocal phase shift properties. General properties
and performance are first evaluated by a one-dimensional silicon slot waveguide
model, to find optimal asymmetric waveguide profiles. The results are verified
with a two-dimensional calculation for a realistic optimal waveguide structure.
The achieved ratio of the waveguide nonreciprocal phase shift to the specific
Faraday rotation of the magnetooptic material is at a level comparable with
semiconductor waveguides having a garnet cladding. The geometry may be applied
to silicon-based vertical slot waveguides for quasi-TE polarization, which
provides integration potential with active components in Si photonic circuits.
© 2011 IEEE
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