Multi-functional high-efficient reflective polarization converter based on all-metal stereostructured anisotropic metamaterials at terahertz frequency

Abstract

In this paper, a high-efficient reflective polarization converter based on all-metal stereostructured anisotropic metamaterials (AMMs) in terahertz (THz) region was proposed and investigated numerically. The unit-cell structure of the converteris assembled by vertical metallic double L-shaped stereostructures (DLSSs) adhered on the ground plane. The simulated results show that the proposed stereostructured AMMs can convert the incident x/y-polarized (x/y-pol.) wave into the right/left-handed circular polarization (RCP/LCP) wave, y/x-polarized (y/x-pol.) wave, and left/right-handed circular polarization (LCP/RCP) wave at 1.37 THz, 1.45 THz and 1.54 THz, respectively. Furthermore, the high-efficient polarization conversion of the proposed AMMs can be sustained within a wide incident angle from 0° to 75° for both transverse electric (TE) and transverse magnetic (TM) modes. The physical mechanisms of the observed polarization conversion are elucidated by taking advantage of surface current distributions. The further simulation results indicate that the operation frequency can be adjusted by changing the geometric parameters of the DLSSs. The proposed stereostructured AMMs-based reflective polarization converter can find potential THz applications, such as remote sensors, imaging systems, and reflector antennas.