Abstract
A periodic asymmetrically loaded photonic-crystal (PC) based polarization
converter has been designed and fabricated. The polarization converter
structure consists of a single defect line square hole PC slab waveguide
with asymmetrically loaded top layer. The design methodology consists of
finding the birefringence induced by geometrical asymmetry through full-wave
modal analysis. The proposed design methodology can be extended to arbitrary
air hole shape photonic-crystal-based polarization converter. The length and
total number of top loaded layers are determined upon full-wave modal
analysis. The thickness of the loaded top layer has been optimized to
provide wideband and low loss polarization conversion. The optimized
thickness of the top loaded layer is 0.2a for which polarization conversion
takes place over the propagation distance of $13\lambda_{0}$. For this distance, the coupling efficiency higher than 90% is
achieved within the normalized frequency band of 0.258–0.267
corresponding to 584–604.5 GHz for the design example presented in Section III.
© 2009 IEEE
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