Angle MultifunctionalDichroism in Metasurfaces

We demonstrate metasurfaces with strong polarization dichroism that depends on the angle of incidence. We present original designs obtained through topology optimization that selectively transmit specific linear or circular polarizations at different incident angles, while the orthogonal polarization transmission is suppressed. The designed metasurfaces exceed 95% transmission efficiency and 50× extinction ratio within the target angle ranges. The experimental characterization of fabricated metasurfaces confirms the desired operation with 90% transmission efficiency and 10× polarization extinction ratio. These results provide important insights into nonlocal and <i>k</i>-space engineering of metasurface response, and the results reveal new opportunities for future multifunctional and angle-selective polarization devices that can find applications in specialized optical instruments and end-user devices.