Abstract
The beam-propagation method is applied to the analysis of a bent embedded waveguide with a loaded metal
film. As a basic study, coupled bent slab waveguides are treated to discuss their mechanism for reducing the pure bend
and transition losses. Based on this study, a metal film is loaded on the bent embedded waveguide. The metal film
serves to generate the surface plasmon-polariton mode for the transverse-magnetic (TM) wave, so that the embedded
waveguide with the metal film can be regarded as coupled bent waveguides for the TM wave. This leads to reduction in
the bend losses for the TM wave. As a result, a low polarization dependent loss (PDL) can be obtained over a wide
spectral range, since the pure bend loss of the embedded waveguide for the TM wave is larger than that for the
transverse-electric wave. Furthermore, the application to a trench structure with a depressed refractive index
contributes not only to a low PDL but also to a low pure bend loss.
© 2013 IEEE
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