Tri-Band/Ultra-Broadband Switchable Terahertz Metamaterial Absorber Based on Graphene Patches

IF 2.2 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

Journal of Electronic Materials Pub Date : 2024-08-03 DOI:10.1007/s11664-024-11348-7

Yulong Liu, Zhongyin Xiao, Xianshun Cai, Qi Zheng

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Abstract

A tri-band/ultra-broadband switchable terahertz absorber based on graphene patches is proposed in this paper. By changing the bias voltage of the graphene patches, the operating modes of the absorber can be switched between tri-band and ultra-broadband absorption. The simulation results show that the absorption bandwidth can reach 6.34 THz when the mode is ultra-broadband absorption, and the relative bandwidth is 159.3%. The absorption bandwidths can reach 0.73 THz, 0.74 THz, and 0.59 THz, respectively, when the mode is tri-band absorption, and perfect absorption appears at 1.12 THz, 4.12 THz, and 6.86 THz. The absorptance within the absorption bands can exceed 90% in both modes. In addition, the absorber is characterized by polarization insensitivity, and it can maintain high absorptance of greater than 90% with an incidence angle below 40°. The physical mechanisms of the proposed absorber are analyzed by electric field distribution and equivalent circuit theory. We believe the absorber is a potential candidate for terahertz 6G communication and electromagnetic stealth.

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基于石墨烯贴片的三频/超宽带可切换太赫兹超材料吸收器

本文提出了一种基于石墨烯贴片的三频/超宽带可切换太赫兹吸收器。通过改变石墨烯贴片的偏置电压，吸收器的工作模式可以在三频和超宽带吸收之间切换。仿真结果表明，当模式为超宽带吸收时，吸收带宽可达 6.34 THz，相对带宽为 159.3%。当模式为三带吸收时，吸收带宽分别可达 0.73 太赫兹、0.74 太赫兹和 0.59 太赫兹，完美吸收出现在 1.12 太赫兹、4.12 太赫兹和 6.86 太赫兹。在这两种模式下，吸收带内的吸收率均超过 90%。此外，该吸收器还具有极化不敏感性的特点，在入射角低于 40° 时仍能保持 90% 以上的高吸收率。我们通过电场分布和等效电路理论分析了所提吸收器的物理机制。我们认为该吸收器是太赫兹 6G 通信和电磁隐身的潜在候选材料。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Electronic Materials 工程技术-材料科学：综合

CiteScore

4.10

自引率

4.80%

发文量

693

审稿时长

3.8 months

期刊介绍： The Journal of Electronic Materials (JEM) reports monthly on the science and technology of electronic materials, while examining new applications for semiconductors, magnetic alloys, dielectrics, nanoscale materials, and photonic materials. The journal welcomes articles on methods for preparing and evaluating the chemical, physical, electronic, and optical properties of these materials. Specific areas of interest are materials for state-of-the-art transistors, nanotechnology, electronic packaging, detectors, emitters, metallization, superconductivity, and energy applications. Review papers on current topics enable individuals in the field of electronics to keep abreast of activities in areas peripheral to their own. JEM also selects papers from conferences such as the Electronic Materials Conference, the U.S. Workshop on the Physics and Chemistry of II-VI Materials, and the International Conference on Thermoelectrics. It benefits both specialists and non-specialists in the electronic materials field. A journal of The Minerals, Metals & Materials Society.