Terahertz Dual-Polarization Beam Splitter Via an Anisotropic Matrix Metasurface

A metasurface composed of multiple resonator arrangements with a certain phase distribution is capable of efficient wavefront manipulation. An anisotropic matrix metasurface consisting of asymmetric metal cross particles with a near-field coupling-induced achieves simultaneous distinctive dualpolarization anomalous reflections. Using polarization splitting, due to the anisotropic phase gradients of the matrix subunit, the x-and-y-polarization components of the incident terahertz waves can be efficiently deflected with different deflection angles in a single plane or in orthogonal planes. Both simulated and experimental results show that the anisotropic matrix metasurface efficiently reflects the xand y-polarization components of normal incident waves in different directions at 0.32-0.42 THz with a relative bandwidth of 27%, and the maximum deflection coefficient is measured to exceed 85%. The proposed anisotropic matrix metasurface is promising for applications in high-performance terahertz polarization beam splitters, spectral splitting, directional emitters, polarization-sensitive imaging, and polarization multiplexers.