Gradient metasurface for four-direction anomalous reflection in terahertz
Gradient metasurface for four-direction anomalous reflection in terahertz
复制标题
太赫兹四向反常反射的梯度超表面
DOI：
10.1016/j.optcom.2018.01.045
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发表时间：
2018-06
影响因子：
2.4
通讯作者：
Jiang Yannan
中科院分区：
文献类型：
--
作者：
Wang Jiao;Jiang Yannan
本文提出了一种四向异常反射元面。基本单元由正方形和圆形组成，它们被设计成各种尺寸，并以规则的间距排列在超级单元中。然后，适当地组合超级单元模制方形相位梯度超颖表面（PGM）。它安装在一个光学厚度的金镜上，这会抑制所有的光传输。与先前报道的超颖表面显著不同，正方形PGM的特征在于四个方向的反射光束。它考虑了正入射和斜入射。在垂直入射时，四个反射角的度数相等是由于x，− x，y和− y方向的不连续相位梯度造成的，并取决于x-y平面内的对称结构，这一点由表面电流分布揭示出来。入射角在− 20°到20°之间变化，反射角在斜入射时显示。此外，PGM是偏振无关的。通过雷达散射截面的分析，验证了结构对称性是其性能的主要原因。仿真结果表明，该方法为太赫兹波段的元表面设计提供了一种简单有效的策略。拟议的PGM可以帮助聚焦光束、转向光束和成形光束。
In this paper, a four-direction anomalous reflection metasurface is proposed. The basic cells comprise of squares and circles, which are designed at various sizes and arranged in a super cell at regular spacing. Then, properly combining super cells molds a square phase gradient metasurface (PGM). It is mounted on an optical thickness gold mirror, which inhibits all light transmission. Markedly different from previously reported metasurfaces, the square PGM is characterized by four-direction reflection beams. It takes into consideration the normal incidence and the oblique incidence. For the normal incidence, that the degrees of the four reflection angles are identical is due to the x,− x, y and− y directional discontinuous phase gradients, and lies on the symmetric structure in the x o y plane, which is then revealed by the surface current distribution. Incident angles varying from− 20° to 20°, the reflection angles are demonstrated in the oblique incidence. Moreover, the PGM is polarization-independent. The performance is attributed to the symmetry of structure, which is verified by Radar cross section. Simulated results prove that our method offers a simple and effective strategy for metasurface design in terahertz. The proposed PGM can aid in focused beams, steering beams, and shaped beams.
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