Broadband Polarizers Based on Graphene Metasurfaces

TL;DR

This paper introduces ultrathin, tunable graphene-based metasurfaces capable of broadband polarization conversion and quarter-wave plate functions in the terahertz range, advancing integrated THz system components.

Contribution

It presents novel graphene metasurface designs for broadband polarization control, including a quarter-wave plate and cross-polarization converter, with tunable responses.

Findings

Achieved broadband polarization conversion in THz using graphene metasurfaces.

Designed ultrathin, tunable quarter-wave plates and cross-polarizers.

Demonstrated potential for integrated THz system applications.

Abstract

We present terahertz (THz) metasurfaces based on aligned rectangular graphene patches placed on top of a dielectric layer to convert the transmitted linearly polarized waves to circular or elliptical polarized radiation. Our results lead to the design of an ultrathin broadband THz quarter-wave plate. In addition, ultrathin metasurfaces based on arrays of L-shaped graphene periodic patches are demonstrated to achieve broadband cross-polarization transformation in reflection and transmission. The proposed metasurface designs have tunable responses and are envisioned to become the building blocks of several integrated THz systems.