Dual-parameter controlled reconfigurable metasurface for enhanced terahertz beamforming via inverse design method | |
Wu, Qi1,2; Fan, Wen-Hui1,2,3![]() | |
作者部门 | 瞬态光学研究室 |
2024-06 | |
发表期刊 | PHYSICA SCRIPTA
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ISSN | 0031-8949;1402-4896 |
卷号 | 99期号:6 |
产权排序 | 1 |
摘要 | Recently, reconfigurable metasurfaces have emerged as a promising solution for wavefront manipulation in the terahertz (THz) region, providing enhanced beamforming capabilities. However, traditional single-parameter control methods fail to achieve independent phase and amplitude modulation, constraining their modulation capabilities. Meanwhile, forward design methods based on phase matching ignore the structural responses of the non-ideal unit, leading to degraded beamforming performance. Here, we introduce an electrically reconfigurable metasurface composed of bilayer graphene strips based on dual-parameter control. Full-wave simulations demonstrate independent amplitude and phase modulation, achieving the full 360 degrees phase coverage and an adjustable amplitude range from 0 to 0.8 at 2.6 THz. To optimize beamforming performance, particularly for the responses of the non-ideal unit away from the designed frequency, we employed an inverse design method based on a hybrid evolutionary algorithm. This novel approach significantly enhances beam steering, achieving a maximum 60% increase in beam directivity and maintaining over 90% of ideal directivity across a broad frequency range from 1.6 THz to 5 THz. Especially, it achieves a maximum deflection angle of 75 degrees. Meanwhile, the adaptability of the inverse design method is further demonstrated to various optimized objectives. For beam focusing, even with limited phase control (below 210 degrees), this method significantly enhances the focusing quality (up to 150% enhancement) and increases the focusing efficiency from 25% to 40%. Additionally, it effectively mitigates the impact of quantized phase errors on beamforming. This research not only demonstrates potential applications in high-speed THz wireless communication and compact imaging systems but also paves the way for innovative designs in reconfigurable metasurfaces. |
关键词 | reconfigurable metasurfaces terahertz beamforming graphene inverse design |
DOI | 10.1088/1402-4896/ad43c3 |
收录类别 | SCI ; EI |
语种 | 英语 |
WOS记录号 | WOS:001218945700001 |
出版者 | IOP Publishing Ltd |
EI入藏号 | 20242016080491 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.opt.ac.cn/handle/181661/97466 |
专题 | 瞬态光学研究室 |
通讯作者 | Fan, Wen-Hui |
作者单位 | 1.Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Peoples R China |
推荐引用方式 GB/T 7714 | Wu, Qi,Fan, Wen-Hui,Qin, Chong,et al. Dual-parameter controlled reconfigurable metasurface for enhanced terahertz beamforming via inverse design method[J]. PHYSICA SCRIPTA,2024,99(6). |
APA | Wu, Qi,Fan, Wen-Hui,Qin, Chong,&Jiang, Xiao-Qiang.(2024).Dual-parameter controlled reconfigurable metasurface for enhanced terahertz beamforming via inverse design method.PHYSICA SCRIPTA,99(6). |
MLA | Wu, Qi,et al."Dual-parameter controlled reconfigurable metasurface for enhanced terahertz beamforming via inverse design method".PHYSICA SCRIPTA 99.6(2024). |
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