Functionality-switchable terahertz polarization converter based on a graphene-integrated planar metamaterial

• DOI: 10.1364/osac.1.000124
• Publication Date: 2018-09-12T17:31:13Z
• Authors: Wei Zhang; Jianli Jiang; Jing Yuan; Shuang Liang; Jisong Qian; Jing Shu; Liyong Jiang
• Keywords: 02 engineering and technology; 0210 nano-technology

We report a functionality-switchable terahertz polarization converter based on an L-shaped planar metamaterial arranged the graphene/hBN/Si/SiO2/Ag substrate. By dynamically controlling chemical potential of graphene sheet, we demonstrate functional switch from high-performance quarter-wave plate (ellipticity more than 0.97) to half-wave (PCR>97%) within working bandwidth 4.80 THz 5.10 THz. The physical mechanism our proposed active device is well explained both macroscopic and microscopic sides. This shows compact structure convenient in fabrication gate-voltage operation, which may be applied practical imaging, detection, communication.