Phys.org  October 15, 2024 Janus metasurfaces have the ability to control light asymmetrically at the pixel level within thin films. However, previous demonstrations are restricted to the partial control of asymmetric transmission for a limited set of input polarizations, focusing primarily on scalar functionalities. Researchers in the Republic of South Korea developed optical bi-layer metasurfaces that achieve a fully generalized form of asymmetric transmission for any input polarization. The theoretical model revealed a fundamental correlation between the polarization-direction channels of opposing sides. They partitioned the transmission space to realize four distinct vector functionalities within the target volume. As a proof […]