Deng Li, Zhang Yuanyuan, Zhu Jianfeng, Qu Meijun, Wang Ling, Zhang Chen
Beijing Key Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications, No.10 Xitucheng Rd., Beijing 100876, China.
School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, No.10 Xitucheng Rd., Beijing 100876, China.
Materials (Basel). 2018 Sep 25;11(10):1817. doi: 10.3390/ma11101817.
Viewing the trend of miniaturization and integration in modern electronic device design, a reconfigurable multi-functional graphene-based metasurface is proposed in this paper. By virtue of the reconfigurability of reflection patterns, this metasurface is able to independently manipulate orthogonal linearly polarized terahertz wave. The building blocks of the proposed metasurface are series of graphene-strips-based unit-cells. Each unit-cell consists of two orthogonal graphene strips and a grounded substrate, which has anisotropic responses for each of orthogonal polarizations (x-polarized and y-polarized waves). The reflection phases of both x- and y-polarized waves can be controlled independently through separate electrical tuning. Based on the proposed metasurface, functionalities including beam splitting, beam deflecting, and linear-to-circular polarization converting using a shared aperture are numerically demonstrated and analyzed. Simulation results demonstrate excellent performance, which is consistent with the theorized expectations. This work paves the way for enhancing the miniaturization of modern electronic/optical devices and potentially has important applications in the next-generation information systems for communication, sensing, and imaging.
鉴于现代电子设备设计中的小型化和集成化趋势，本文提出了一种可重构的多功能石墨烯基超表面。借助反射图案的可重构性，这种超表面能够独立操控正交线偏振太赫兹波。所提出的超表面的基本单元是一系列基于石墨烯条带的单元胞。每个单元胞由两条正交的石墨烯条带和一个接地基板组成，该基板对每个正交偏振（x偏振和y偏振波）具有各向异性响应。通过单独的电调谐可以独立控制x偏振波和y偏振波的反射相位。基于所提出的超表面，数值演示并分析了包括使用共享孔径进行光束分裂、光束偏转和线偏振到圆偏振转换等功能。仿真结果显示出优异的性能，这与理论预期一致。这项工作为提高现代电子/光学设备的小型化铺平了道路，并可能在下一代通信、传感和成像信息系统中具有重要应用。
