Tunable broadband terahertz absorber based on star-shaped ring graphene metasurface

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-05-01 DOI:10.1117/1.jnp.18.026004

Omekulsum Damavandi Asli, Mohammad Yazdi, Behrad Rezaee Rezvan

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Abstract

We introduced a tunable terahertz broadband absorber with near-unity absorption based on a graphene metamaterial. A periodic array of star-shaped ring graphene resonators along with a silicon dioxide substrate backed with a ground plane forms the absorbing structure. The absorption rate of the ultimate optimal absorber is more than 90% in the 0.8 to 2.4 terahertz frequency range, which is equivalent to a relative bandwidth of 100% at a central frequency of 1.6 terahertz. It is shown that the proposed structure retains its absorption bandwidth with an absorption level of more than 75% up to a 60-deg elevation angle for different wave polarizations. In addition, by increasing the chemical potential of graphene in the proposed structure from 0.1 to 0.9 eV, the absorption rate of the structure can be tuned from 40% to nearly 100%. The effects of different geometrical parameters of the structure on the absorption rate of the structure are also investigated, and the absorption mechanism of the presented absorber is investigated by interference and impedance matching theories. Finally, the simulation results are compared with calculated analytical ones, where good agreement between the results is observed. The proposed absorber has potential application in terahertz frequencies such as cloaking, modulators, tunable filters, sensors, and imaging systems.

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基于星形环状石墨烯元表面的可调谐宽带太赫兹吸收器

我们介绍了一种基于石墨烯超材料的可调谐太赫兹宽带吸收器，它具有近乎统一的吸收率。星形环状石墨烯谐振器的周期性阵列与二氧化硅衬底和地平面构成了吸收结构。在 0.8 至 2.4 太赫兹频率范围内，最终最佳吸收器的吸收率超过 90%，相当于 1.6 太赫兹中心频率下 100%的相对带宽。研究表明，在不同的波极化情况下，所提出的结构都能保持其吸收带宽，在 60 度仰角时吸收水平超过 75%。此外，通过将拟议结构中石墨烯的化学势从 0.1 eV 提高到 0.9 eV，该结构的吸收率可从 40% 调整到接近 100%。此外，还研究了结构的不同几何参数对结构吸收率的影响，并通过干涉和阻抗匹配理论研究了所提出的吸收器的吸收机理。最后，将仿真结果与分析计算结果进行了比较，结果显示两者之间具有良好的一致性。所提出的吸收器有望应用于太赫兹频率，如隐形、调制器、可调谐滤波器、传感器和成像系统。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.