A Tunable Transparent Graphene Absorber with Multifrequency Resonance

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advanced Electronic Materials Pub Date : 2024-10-18 DOI:10.1002/aelm.202400372

Chen Chen, Guang Cui, Jiawei Yang, Feng Zhang, Huihui Wang, Baolu Guan

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Abstract

The demand for multinarrowband absorber has attracted increasing interest among researchers in recent years. However, integrating multifrequency absorption, tunability, and high optical transparency into an absorber remains a crucial challenge. In this study, a multiband, tunable, and transparent microwave meta-absorber is theoretically proposed and experimentally demonstrated. This meta-absorber is composed of resonant patterns made from graphene and indium tin oxide (ITO), placed on a substrate of lithium niobate (LN). By introducing P-type doping to reduce the resistance of monolayer graphene to around 300 Ω, the impedance matching of the absorber is promoted, consequently manifesting ten absorption points within 40 GHz. The electric field distribution analysis and an equivalent circuit model are employed to elucidate the physical mechanisms of the multiband absorber. Additionally, the lithium niobate dielectric layer possesses a substantial dielectric constant and exhibits phase transition characteristics with temperature changes. When the temperature increases to 250 °C, a comprehensive tuning range of more than 5.49 GHz within 40 GHz range is realized. The maximum tuning range for a single frequency point is 1.33 GHz. With the broadening of the band, the meta-absorber can provide multiple tunable ranges, making it more favorable for practical applications in optical modulator and sensor.

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具有多频共振的可调谐透明石墨烯吸收器

近年来，研究人员对多窄带吸收器的需求日益增长。然而，如何将多频吸收、可调谐性和高光学透明度集成到吸收器中仍然是一项重要挑战。本研究从理论上提出了一种多频带、可调谐和透明的微波元吸收器，并进行了实验演示。这种元吸收器由放置在铌酸锂基底上的石墨烯和氧化铟锡（ITO）谐振图案组成。通过引入 P 型掺杂，将单层石墨烯的电阻降低到 300 Ω 左右，促进了吸收器的阻抗匹配，从而在 40 GHz 范围内实现了十个吸收点。利用电场分布分析和等效电路模型阐明了多频带吸收器的物理机制。此外，铌酸锂介电层具有很高的介电常数，并随着温度的变化呈现出相变特性。当温度升高到 250 ℃ 时，可在 40 GHz 范围内实现超过 5.49 GHz 的综合调谐范围。单个频点的最大调谐范围为 1.33 GHz。随着频带的拓宽，元吸收器可以提供多个可调谐范围，从而更有利于光调制器和传感器的实际应用。

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来源期刊

Advanced Electronic Materials NANOSCIENCE & NANOTECHNOLOGYMATERIALS SCIE-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

11.00

自引率

3.20%

发文量

433

期刊介绍： Advanced Electronic Materials is an interdisciplinary forum for peer-reviewed, high-quality, high-impact research in the fields of materials science, physics, and engineering of electronic and magnetic materials. It includes research on physics and physical properties of electronic and magnetic materials, spintronics, electronics, device physics and engineering, micro- and nano-electromechanical systems, and organic electronics, in addition to fundamental research.