Terahertz linear to circular polarization converter based on reflective metasurface

Abstract

Metasurfaces are two-dimensional artificial structures which have extraordinary electromagnetic properties. They have been used in myriad of devices such as nano-antennas, cloaking coatings, imaging devices, flat lenses, and polarization converters over a wide range of frequency. Due to high dependency of many devices on incident wave polarization, manipulating the polarization of electromagnetic waves would be useful, especially in the THz regime. In this study, we propose a linear to circular polarization converter (LTC-PC) based on a THz reflective metasurface. For a TE linear polarization incident wave, this structure has two distinct bands; the first one lays in a wideband frequency range of 0.5-1.41 THz, in which the reflected wave would be a left-handed circular polarization (LHCP) with minimum efficiency of 89% and maximum efficiency of more than 95% in 80% of the bandwidth. The second band lays in the narrowband frequency range of 1.45-1.55 THz, resulting a right-handed circular polarization (RHCP) wave with a minimum efficiency of 82%. The proposed polarization converter can be used in optical communication and electronic devices.

Wideband and wide-angle reflective metasurface for efficient linear and circular polarization conversion in X, Ku, and K bands

“…Furthermore, combining natural materials with the Faraday effect, chiral liquid crystals, helical secondary proteins, and chiral gases and solutions provides additional avenues for polarization control [8]. Metasurface-based polarization converters have been investigated extensively, offering significant advantages for both circular and linear polarization across various frequency ranges, including terahertz [9][10][11][12][13], microwave [9,[14][15][16], and in optical frequency ranges [9,[17][18][19]. Polarization state conversion has been accomplished by using a variety of metasurface configurations, such as V-shaped antennas [20], rectangular antenna arrays [21,22], elliptical nanoposts [23], and orthogonal nanorods and nanoslits [24].…”