太赫兹辐射
材料科学
超材料
光电子学
多波段设备
极化(电化学)
圆极化
光学
太赫兹超材料
分裂环谐振器
太赫兹光谱与技术
传输(电信)
各向异性
物理
电信
远红外激光器
化学
激光器
物理化学
微带线
计算机科学
天线(收音机)
作者
Yongzhi Cheng,Fan Jiang,Hui Luo,Chen Fu,Naixing Feng,Xuesong Mao,Rongzhou Gong
摘要
In this paper, we present an anisotropic metamaterial (AMM) composed of a sub-wavelength metal grating sandwiched with bi-layered double-arrow-shaped (DAS) structure array, which can achieve high-efficiency circular polarization (CP) conversion via giant asymmetric transmission (AT) in terahertz (THz) region. Numerical simulation results indicate that near complete CP conversion with cross-polarization transmission coefficients can reach 0.91 and 0.93, which can be observed at 0.31 and 0.55 THz, respectively. Based on the combination of polarization conversion effects and Fabry-Perot-like cavity-enhanced effect of AMMs, the AT parameter for CP wave can reach a maximum of 0.83 at 0.30 THz, and 0.87 at 0.56 THz, respectively. With appropriate geometric parameters design of each unit-cell, embedded in the proposed AMM, the cross-polarization transmission coefficient and AT parameter for CP waves can be increased to the maximal values of 0.98 and 0.9, respectively. The proposed AMM shows great potential applications in high performance dual-band CP convertor and isolator in THz region.
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