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Achiral Metasurfaces-Induced Circular Polarization Differential Transmittance

Chiral metasurfaces have different interactions with circularly polarized incidences, showing as circular dichroism and optical activity. Here, we adopt achiral meta-atoms to achieve the function similar to chirality by spin decoupling. Specifically, for two circularly polarized illuminations, one channel is scattering randomly, and the other channel transmits directly or is designed for realizing a specific function. The proposed scheme shows greater flexibility than previous schemes which require elaborate designed structure of the meta-atoms to achieve chirality.