A terahertz sensor based on tunable patterned graphene metamaterial absorber with high absorptivity and sensitivity

IF 3 Q2 PHYSICS, CONDENSED MATTER
Zishan Yang , Anqi Li , Zhitao Wang , Feng Huang , Zhaoyang Chen
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Abstract

Terahertz metamaterial sensors hold significant promise in various fields, including biomedicine, agricultural production, non-destructive testing, and national defense security. This study introduces a metamaterial biomedical sensor based on patterned graphene absorber. The absorption spectrum obtained through simulation calculation in the CST microwave studio shows three distinct absorption peaks at 4.40 THz, 5.92 THz, and 8.47 THz, with corresponding absorptivity of 99.62%, 100%, and 88.12%. The simulation results were validated through impedance matching theory, and the formation mechanisms of the three absorption peaks were analyzed by examining electric field intensity, surface current and structural parameters. By modulating the Fermi level of graphene, dual control over absorptivity and resonant frequency can be achieved. Adjusting the relaxation time enables modulation of the absorptivity. Most importantly, the sensor not only demonstrates high absorption efficiency but also achieves a sensitivity of up to 2.717 THz/RIU. Furthermore, it shows potential in detecting basal cell carcinoma (BCC), as evidenced by the significant frequency shift observed between the absorption spectra of normal skin and BCC. The maximum sensitivity for detecting red blood cell infected with malaria reached 3.846 THz/RIU. Consequently, it is believed that the proposed sensor has great application potential in biosensing.
一种基于可调图像化石墨烯超材料吸收体的太赫兹传感器,具有高吸收率和灵敏度
太赫兹超材料传感器在包括生物医学、农业生产、无损检测和国防安全在内的各个领域都有重要的前景。本研究介绍了一种基于图案化石墨烯吸收体的超材料生物医学传感器。通过CST微波室模拟计算得到的吸收光谱在4.40 THz、5.92 THz和8.47 THz处有三个不同的吸收峰,对应的吸收率分别为99.62%、100%和88.12%。通过阻抗匹配理论对仿真结果进行了验证,并通过考察电场强度、表面电流和结构参数分析了三个吸收峰的形成机理。通过调制石墨烯的费米能级,可以实现对吸光率和谐振频率的双重控制。调节弛豫时间可以调节吸收率。最重要的是,该传感器不仅具有较高的吸收效率,而且灵敏度高达2.717 THz/RIU。此外,它显示出检测基底细胞癌(BCC)的潜力,正如在正常皮肤和基底细胞癌的吸收光谱之间观察到的显著频移所证明的那样。检测疟疾感染红细胞的最高灵敏度为3.846 THz/RIU。因此,认为该传感器在生物传感领域具有很大的应用潜力。
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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CiteScore
6.50
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