Broadband terahertz reconfigurable metasurface based on 1-bit asymmetric coding metamaterial
Broadband terahertz reconfigurable metasurface based on 1-bit asymmetric coding metamaterial
复制标题
基于1位非对称编码超材料的宽带太赫兹可重构超表面
DOI：
10.1016/j.optcom.2019.124770
复制
发表时间：
2020-03-01
影响因子：
2.4
通讯作者：
Mazumder, Pinaki
中科院分区：
文献类型：
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作者：
Zeng, Hongxin;Lan, Feng;Mazumder, Pinaki
多年来，太赫兹超表面一直引起广泛的关注。然而，太赫兹可重构元表面仍然是一个重大的挑战。提出了一种基于1位非对称编码的宽带太赫兹可重构超表面。不对称的超材料打破了电荷平衡，提供了多重共振，有利于扩大工作带宽。传统的编码超材料通过改变贴片的形状或大小来改变相位。所提出的超材料只需断开或连接超材料中的金属线即可获得1比特的相位信息，这有利于设计可重构的编码超表面。模拟和实验结果表明，非对称超材料能有效反射0.34 ~ 0.49太赫兹的正入射波，相对带宽为36%，反射系数超过80%。此外，超表面的仿真和实验结果表明，通过配置不同编码序列的超材料，正常入射波以预期角度的双光束反射。这项工作为开发有价值的动态太赫兹波束扫描设备提供了重要的潜在应用。
Terahertz metasurface has always aroused extensive attention for many years. However, terahertz reconfigurable metasurface is still a significant challenge. The broadband terahertz reconfigurable metasurface based on 1-bit asymmetric coding metamaterial is presented in this paper. The asymmetric metamaterial breaks the charge balance and provides multiple resonances, which is conducive to expanding the operating bandwidth. Conventional coding metamaterials change phase by varying the shape or size of the patch. The proposed metamaterial only disconnects or connects the metal lines in the metamaterial to obtain 1-bit phase information, which is beneficial for designing reconfigurable coding metasurface. Both simulated and experimental results show that the asymmetric metamaterial efficiently reflects the normal incident waves at 0.34-0.49 THz with a relative bandwidth of 36%, and the reflection coefficients are measured to exceeds 80%. Furthermore, the simulation and experimental results of the metasurface show that the normal incident wave is reflected as a double beam of the expected angle by configuring metamaterials with different coding sequences. This work provides important potential applications for the development of valuable dynamic terahertz beam scanning devices.