司黎明，汤鹏程，吕昕
（北京理工大学毫米波与太赫兹技术北京市重点实验室，中国 北京，100081）
摘要：提出了一种基于石墨烯的太赫兹智能超表面（RIS）。通过调节化学势能，该智能超表面能够实现对线极化太赫兹波的反射相位动态控制，进而实现太赫兹波束成形。为了获得超单元360°的反射相位调控范围，设计了工字形金属谐振器集成石墨烯的超单元结构，这种集成结构加强了超表面的局部电场，拓展了反射相位动态调控范围。基于异常反射和编码超材料原理，该智能超表面可具备近场波束偏转和远场波束分裂等波束成形功能，为灵活调控太赫兹波提供了新的思路，有望运用到6G无线通信、太赫兹遥感、空间态势感知等领域。
关键词：太赫兹；智能超表面；石墨烯；异常反射；编码超材料；波束成形
Graphene-Based Reconfigurable Intelligent Surface for Terahertz Wave Beamforming
SI Liming, TANG Pengcheng, LYU Xin
(Beijing Key Laboratory of Millimeter Wave and Terahertz Technology, Beijing Institute of Technology, Beijing 100081, China)
Abstract: A graphene-based reconfigurable intelligent surface (RIS) is proposed for terahertz beamforming. By adjusting the chemical potential energy, the reflection phase of linearly polarized incident electromagnetic wave can be controlled. The Gong-shaped metal resonator strengthens the local electric field of metasurface, widening the regulation range of reflection phase. According to the principle of anomalous reflection and coding metasurface, the deflection of near-field beam and splitting of far-field beam is realized, which could be a new idea for flexible regulation of terahertz beamforming. The results show that the proposed graphene-based terahertz RIS can be expected to play a key role in 6G communication, terahertz remote sensing, and space situational awareness.
Keywords: terahertz; reconfigurable intelligent surface; graphene; anomalous reflection; coding metasurface; beamforming
.png)
.png)
.png)
