Polarization-Dependent Full-Space Beam Steering with Orbital-Angular-Momentum Mode by Anisotropic Coding Metasurface

Coding metasurfaces have attracted much attention in recent years. Here, we propose a novel polarization-dependent full-space beam-steering anisotropic coding metasurface to radiate beams with orbital-angular-momentum (OAM) modes. When the polarizations of incident electromagnetic waves are orthogonal, the beams can be emitted to the upper and lower half spaces with different coding information, respectively. A scheme is presented to radiate multiple OAM modes with different deflecting angles to the corresponding spaces. This work has great potentials in multi-target communications and tracking radar systems.