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We demonstrate that twisted solid-core PCF develops strongly enhanced optical activity and circular dichroism in the vicinity of orbital angular momentum resonances in the cladding. It may be used as a circular polarizer.
In optically active materials and devices, the plane of vibration of linearly polarized light is rotated due to different phase indices of left- and right-circularly (LC and RC) polarized light, i.e., there is circular birefringence. Optical fibers with high circular birefringence are able to maintain circular polarization states against external perturbations such as bending and mechanical stress...
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