A Wideband Transmittive-Type Cross Polarization Converter for Terahertz Waves

Abstract

A bilayer metasurface constituting of asymmetric split-ring resonator (ASRR) array as top layer and an E-Shaped resonator (ER) array as a bottom layer has been discussed in this paper. The former is aimed to make the waves passing through it go unaltered while the latter behaving as a bandstop filter through which polarization selectivity feature has been achieved. The measured transmission is maximized to 0.68 at 1.15 THz leading to realization of polarization conversion ratio (PCR) up to 99.9%. The PCR is above 90% in the range of 1.07–1.21 THz. The proposed structure has been compared with the other conventionally used optical devices. The polarization conversion of the structure has been carried out for various substrate materials used in the terahertz region like silicon dioxide and preperm L270(lossy). © 2021, Springer Nature Singapore Pte Ltd.