A polarization extinction ratio of over 10 dB is achieved for both propagating directions. The transmission axes of the chiral polarizer are different for forward and backward propagation. Here, inspired by the anti-PT symmetry, we demonstrate, for the first time to our best knowledge, an on-chip chiral polarizer by constructing a polarization-coupled anti-PT symmetric system. However, to our best knowledge, chiral switching for polarization states has never been reported, although chiral polarization manipulation has significant applications in imaging, sensing, communication, etc.
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