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The mechanism of polarization-dependent bandgap formation for nematic liquid crystal filled photonic crystal fibers (LCPCFs) is presented. The total polarization-independent bandgap map is not applicable for describing the mode guiding in LCPCF. We propose the formation of two orthogonal polarization-dependent bandgap maps to describe the mode guiding behavior. The formation of polarization-dependent bandgap caused by the high index difference between the ordinary and the extraordinary dielectric indexes of liquid crystal offers single-mode single-polarization or ultrahigh birefringence guiding for LCPCFs.
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Ren et al. (2008) studied this question.
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