High sensitivity of a perfect absorber based on octagonal-star and circular ring patterned graphene metasurface

IF 3.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Optical and Quantum Electronics Pub Date : 2024-11-23 DOI:10.1007/s11082-024-07779-5

Kaiqiang Cao, Zongnian Lu, Jukun Liu, Jiali Yao, Hongxiang Dai, Jiaqi Ju, Hongwei Zhao

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Abstract

This study presents a triple-band terahertz tunable perfect absorber designed with an octagonal-star and circular ring monolayer graphene metasurface, noted for its tunability, polarization insensitivity, and high sensitivity. The graphene absorber was simulated using the finite element method and validated through impedance matching. Simulation results reveal three perfect absorption peaks at 5.5, 7.87, and 9.25 THz, with absorption rates reaching approximately 99% at 7.87 and 9.25 THz. Variations in the dielectric layer material, along with adjustments to the structural and intrinsic graphene parameters, were analyzed to optimize the efficiency of the triple-band absorption peaks. The simulations show that the structure’s high symmetry provides incident and polarization insensitivity, maintaining absorption rates above 98% over a broad range of incident and azimuth angles. The device’s sensing performance was evaluated by varying the ambient refractive index, achieving a maximum sensitivity (S) of 5.329 THz/RIU. These results indicate that this high-sensitivity sensor holds significant potential for applications in sensing, tunable spectral detection, and environmental monitoring.

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基于八角星和圆环图案石墨烯元表面的完美吸收器的高灵敏度

本研究介绍了一种三波段太赫兹可调谐完美吸收器，该吸收器采用八角星形和环形单层石墨烯元表面设计，以其可调谐性、偏振不敏感性和高灵敏度而著称。利用有限元法对石墨烯吸收器进行了仿真，并通过阻抗匹配进行了验证。模拟结果显示，在 5.5、7.87 和 9.25 太赫兹处有三个完美的吸收峰，在 7.87 和 9.25 太赫兹处的吸收率约为 99%。我们分析了介电层材料的变化以及石墨烯结构和内在参数的调整，以优化三波段吸收峰的效率。模拟结果表明，该结构的高度对称性提供了入射和偏振不敏感性，在广泛的入射角和方位角范围内都能保持 98% 以上的吸收率。通过改变环境折射率评估了该器件的传感性能，其最大灵敏度 (S) 达到 5.329 THz/RIU。这些结果表明，这种高灵敏度传感器在传感、可调谐光谱检测和环境监测方面具有巨大的应用潜力。

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来源期刊

Optical and Quantum Electronics 工程技术-工程：电子与电气

CiteScore

4.60

自引率

20.00%

发文量

810

审稿时长

3.8 months

期刊介绍： Optical and Quantum Electronics provides an international forum for the publication of original research papers, tutorial reviews and letters in such fields as optical physics, optical engineering and optoelectronics. Special issues are published on topics of current interest. Optical and Quantum Electronics is published monthly. It is concerned with the technology and physics of optical systems, components and devices, i.e., with topics such as: optical fibres; semiconductor lasers and LEDs; light detection and imaging devices; nanophotonics; photonic integration and optoelectronic integrated circuits; silicon photonics; displays; optical communications from devices to systems; materials for photonics (e.g. semiconductors, glasses, graphene); the physics and simulation of optical devices and systems; nanotechnologies in photonics (including engineered nano-structures such as photonic crystals, sub-wavelength photonic structures, metamaterials, and plasmonics); advanced quantum and optoelectronic applications (e.g. quantum computing, memory and communications, quantum sensing and quantum dots); photonic sensors and bio-sensors; Terahertz phenomena; non-linear optics and ultrafast phenomena; green photonics.