A 140 GHz High Extinction Ratio Sandwich Terahertz Polarizer

Based on the flexible ultra-thin polymide, a single-sided single-layer sub-wavelength metal grating polarizer is given. Based on a single-sided single-layer polarizer, a high extinction ratio sandwich terahertz polarizer was designed. The polarizer is of a sandwich type with a 10 um in thickness substrate. The results show that at 0.14 THz, the extinction ratio of the device reaches 103 dB, which is much higher than that of the existing polarizers. Therefore, the design of this paper has certain reference value for the research and commercial use of terahertz modulation devices and the integration of terahertz communication systems.