Phys.org  May 8, 2023 Metasurfaces have been rapidly advancing our command over the many degrees of freedom of light; however, so far, they have been mostly limited to manipulating light in free space. Metasurfaces integrated on top of guided-wave photonic systems have been explored to control the scattering of light off-chip with enhanced functionalities. However, these efforts have so far been limited to controlling one or two optical degrees of freedom at best. A team of researchers in the US (Columbia University, City University of New York) has developed leaky-wave metasurfaces, which are based on symmetry-broken photonic crystal slabs that […]