Reconfigurable Polarizer Based on Bulk Dirac Semimetal Metasurface
Reconfigurable Polarizer Based on Bulk Dirac Semimetal Metasurface
复制标题
基于块体狄拉克半金属超表面的可重构偏振器
DOI：
10.3390/cryst10030228
复制
发表时间：
2020-03-01
期刊：
影响因子：
2.7
通讯作者：
Wang, Jiao
中科院分区：
文献类型：
--
作者：
Jiang, Yannan;Zhao, Jing;Wang, Jiao
In this paper, we propose a reflective polarizer in terahertz regime, which utilizes the Bulk-Dirac-Semimetal (BDS) metasurface can be dynamically tuned in broadband. The proposed polarizer is capable of converting the linear polarized wave into the circular polarized or the cross polarized waves by adjusting the Fermi energy (EF) of the BDS. In the frequency range of 0.51 THz and 1.06 THz, the incident linear polarized wave is converted into a circular polarized wave with an axial ratio (AR) less than 3 dB when EF = 30 meV. When EF = 45 meV, the cross-polarization conversion is achieved with the polarization conversion ratio (PCR) greater than 90% in the band of 0.57−1.12 THz. Meanwhile, the conversion efficiencies for both polarization conversions are in excess of 90%. Finally, the physical mechanism is revealed by the decomposition of two orthogonal components and the verification is presented by the interference theory.
