Wide-Angle Reflector for Terahertz Waves Based on Metasurfaces
随着太赫兹技术的发展以及全球对6G通信的研究和期望，太赫兹通信技术获得了广泛的关注。但是太赫兹波具有很强的方向性，常常进行端对端的传播，且传播过程中容易被障碍物阻挡，太赫兹通信中的广角和定向传播成为技术难点。设计一种新的广角反射超构表面，其可将入射角为5°~45°的太赫兹波反射聚焦在同一位置，该位置距离样品600 mm，方向为13°。采用共振相位调制原理设计单元结构，利用透镜聚焦原理和相位补偿原理对单元结构进行排布并进行加工。在220 GHz工作频率下进行实验验证，实验结果证实了该器件的功能。所提方案为解决太赫兹6G通信难题提供了一个有效途径，具有一定的应用前景。
With the development of terahertz technology, the global research and anticipation regarding 6G communication based on terahertz waves has gained considerable research attention. However, the transmission of terahertz waves is directional, involves end-to-end propagation, and is often blocked by obstacles. Therefore, realizing wide angle and directional transmission of terahertz waves for communication is technically difficult. Herein, a new metasurface was designed and verified to realize the wide angle and directional reflection of terahertz waves. To realize the focusing function of metasurface and control the phase of light field, the transmission phase modulation principle was adopted in designing the unit structure. This unit structure was arranged based on the lens focusing principle and phase compensation principle. Simulations and experiments were conducted at a working frequency of 220 GHz. Our findings verified that the proposed metasurface can reflect the terahertz waves over a wide angle range of 5°?45° and focus it with a focal length of 600 mm along the direction of 13°. The design scheme proposed provides an effective approach to solve the problems associated with 6G communication based on terahertz waves and has a certain application prospect.
陈薇竹, 张翠玲, 邵麟杰, 何敬锁, 张岩. 基于超构表面的太赫兹广角反射器[J]. 激光与光电子学进展, 2023, 60(18): 1811020. Weizhu Chen, Cuiling Zhang, Linjie Shao, Jingsuo He, Yan Zhang. Wide-Angle Reflector for Terahertz Waves Based on Metasurfaces[J]. Laser & Optoelectronics Progress, 2023, 60(18): 1811020.