Photonic spin Hall effect in PT symmetric metamaterials
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We proposed and demonstrated that PT symmetric metamaterials could be used to achieve enhanced spin Hall effect (SHE) of light. We find that when laser mode is excited in PT symmetric system, the enhanced SHE could be obtained in both transmitted and reflected beams. In addition, as exceptional points (EPs) of PT symmetric system can happen for both p- and s-polarizations, the enhanced SHE of reflected light can function for both horizontally and vertically polarized incident beams. Particularly, these EPs can lead to unidirectional reflectionlessness, asymmetric SHE with maximum contrast ratio of 48 is obtained by launching light beams near EPs. Our work opens up a new path to obtain enhanced transverse displacement for both reflected and transmitted light and enables more opportunities in manipulating photonic SHE.
KeywordsPT symmetry exceptional points laser mode spin Hall effect
This work was supported by the National Natural Science Foundation of China (Grant Nos. 11904169 and 61675095) and the Natural Science Foundation of Jiangsu Province (Grant No. BK20190383).
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