Terahertz dual-polarization beam splitter via an anisotropic matrix metasurface
Terahertz dual-polarization beam splitter via an anisotropic matrix metasurface
复制标题
通过各向异性矩阵超表面的太赫兹双偏振分束器
DOI：
10.1109/tthz.2019.2927890
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发表时间：
2019
影响因子：
3.2
通讯作者：
Daniel M.Mittleman
中科院分区：
文献类型：
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作者：
Hongxin Zeng;Yaxin Zhang;Feng Lan;Shixiong Liang;Lan Wang;Tianyang Song;Ting Zhang;Zongjun Shi;Ziqiang Yang;Xue Kang;Xilin Zhang;Pinaki Mazumder;Daniel M.Mittleman
由具有一定相位分布的多个谐振器布置组成的超表面能够进行有效的波前操纵。由非对称金属十字粒子组成的各向异性矩阵超颖表面通过近场耦合诱导实现了同时独特的双偏振异常反射。使用偏振分裂，由于矩阵子单元的各向异性相位梯度，入射太赫兹波的x偏振分量和y偏振分量可以在单个平面或正交平面中以不同的偏转角被有效地偏转。模拟和实验结果表明，该超颖表面在0.32-0.42 THz范围内有效地反射了垂直入射波在不同方向上的x和y偏振分量，相对带宽为27%，最大偏转系数超过85%.所提出的各向异性矩阵元表面是有前途的高性能太赫兹偏振分束器，光谱分裂，定向发射器，偏振敏感成像和偏振复用器的应用。
A metasurface composed of multiple resonator arrangements with a certain phase distribution is capable of efficient wavefront manipulation. An anisotropic matrix metasurface consisting of asymmetric metal cross particles with a near-field coupling-induced achieves simultaneous distinctive dual-polarization anomalous reflections. Using polarization splitting, due to the anisotropic phase gradients of the matrix subunit, the x- and y-polarization components of the incident terahertz waves can be efficiently deflected with different deflection angles in a single plane or in orthogonal planes. Both simulated and experimental results show that the anisotropic matrix metasurface efficiently reflects the x- and y-polarization components of normal incident waves in different directions at 0.32–0.42 THz with a relative bandwidth of 27%, and the maximum deflection coefficient is measured to exceed 85%. The proposed anisotropic matrix metasurface is promising for applications in high-performance terahertz polarization beam splitters, spectral splitting, directional emitters, polarization-sensitive imaging, and polarization multiplexers.