A Multifunctional Metamaterial Device with Tunable Broadband Absorption and Transmission Characteristics in the Terahertz Region

IF 3.3 4区物理与天体物理 Q2 CHEMISTRY, PHYSICAL Plasmonics Pub Date : 2023-11-30 DOI:10.1007/s11468-023-02138-8

Ying Zhang, Yupei Tang, You Li, Xunjun He

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Abstract

In this paper, a multifunctional terahertz (THz) metamaterial device with multifunction is proposed. Based on graphene and vanadium dioxide (VO₂), tunable broadband absorption and transmission characteristics are realized. While VO₂ is in the metallic phase, the device works in ultra-broadband absorption mode. The bandwidth of over 90% absorption is 5.36 THz, corresponding to a relative bandwidth of 90%. By adjusting the Fermi level of graphene, we can obtain a bandwidth modulation depth of 54%. By changing the conductivity of VO₂, we can achieve an amplitude modulation depth of 87%. While VO₂ is in the insulated phase, the device works in transmission mode. The frequency range of over 90% transmissivity is 5.00–7.15 THz. Similarly, by adjusting VO₂ conductivity, an amplitude modulation depth of 96% can be achieved. Based on transmission line theory, an equivalent circuit is established to reveal the modulation mechanism. Theoretical results are in good agreement with the ones got from simulation. Compared with the papers previously published, the structure has certain advantages on function switching, performance tuning, and modulation depth.

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具有太赫兹区域可调宽带吸收和传输特性的多功能超材料器件

本文提出了一种多功能太赫兹（THz）超材料器件。该器件以石墨烯和二氧化钒（VO2）为基础，实现了可调谐的宽带吸收和传输特性。当二氧化钒处于金属相时，该器件工作在超宽带吸收模式。超过 90% 的吸收带宽为 5.36 太赫兹，相当于 90% 的相对带宽。通过调整石墨烯的费米级，我们可以获得 54% 的带宽调制深度。通过改变 VO2 的电导率，我们可以获得 87% 的振幅调制深度。当 VO2 处于绝缘阶段时，器件工作在传输模式。透射率超过 90% 的频率范围为 5.00-7.15 THz。同样，通过调整 VO2 的电导率，可以实现 96% 的振幅调制深度。根据传输线理论，建立了一个等效电路来揭示调制机制。理论结果与模拟结果十分吻合。与之前发表的论文相比，该结构在功能切换、性能调整和调制深度方面具有一定优势。

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

Plasmonics 工程技术-材料科学：综合

CiteScore

5.90

自引率

6.70%

发文量

164

审稿时长

2.1 months

期刊介绍： Plasmonics is an international forum for the publication of peer-reviewed leading-edge original articles that both advance and report our knowledge base and practice of the interactions of free-metal electrons, Plasmons. Topics covered include notable advances in the theory, Physics, and applications of surface plasmons in metals, to the rapidly emerging areas of nanotechnology, biophotonics, sensing, biochemistry and medicine. Topics, including the theory, synthesis and optical properties of noble metal nanostructures, patterned surfaces or materials, continuous or grated surfaces, devices, or wires for their multifarious applications are particularly welcome. Typical applications might include but are not limited to, surface enhanced spectroscopic properties, such as Raman scattering or fluorescence, as well developments in techniques such as surface plasmon resonance and near-field scanning optical microscopy.