Yang Daquan, Wang Weiguang, Lv Erpeng, Wang Haiming, Liu Bingchao, Hou Yanzhao, Chen Jin-Hui
School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China.
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China.
iScience. 2022 Jul 31;25(8):104824. doi: 10.1016/j.isci.2022.104824. eCollection 2022 Aug 19.
Programmable vanadium dioxide (VO) metasurface is proposed at THz frequencies. The insulating and metallic states of VO can be switched via external electrical stimulation, resulting in the dynamical modulation of electromagnetic response. The voltages of different columns of the metasurface can be controlled by the field-programmable gate array, and thus the phase gradients are realized for THz beam steering. In 1-bit coding, we design periodic and nonperiodic 24 × 24 coding sequences, and achieve wide-angle beam scanning with the deflection angles from -60° to +60°. In 2-bit coding, we use two different meta-atoms to design 18 × 18 coding sequences. Compared with 1-bit coding, 2-bit coding has more degree of freedom to control the optical phase, and 3 dB diffraction efficiency is improved by generating a single deflection angle. The proposed programmable metasurfaces provide a promising platform for manipulating electromagnetic wave in 6G wireless communication.
在太赫兹频率下提出了可编程二氧化钒（VO）超表面。VO的绝缘态和金属态可通过外部电刺激进行切换，从而实现电磁响应的动态调制。超表面不同列的电压可由现场可编程门阵列控制，进而实现太赫兹光束转向的相位梯度。在1位编码中，我们设计了周期性和非周期性的24×24编码序列，并实现了-60°至+60°偏转角的广角光束扫描。在2位编码中，我们使用两种不同的超原子设计了18×18编码序列。与1位编码相比，2位编码在控制光学相位方面具有更大的自由度，并且通过产生单个偏转角提高了3 dB衍射效率。所提出的可编程超表面为6G无线通信中的电磁波操控提供了一个有前景的平台。
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