Enhanced the sensing sensitivity of the metamaterial absorbers with patterned convex graphene in the terahertz

IF 1.8 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Research Express Pub Date : 2024-09-17 DOI:10.1088/2053-1591/ad7922
Yun Liu, Shilin Ma, Zuhong Xiong, Bin Xiong and Lihong Cheng
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Abstract

In this paper, a patterned graphene metamaterial terahertz absorber is theoretically designed. The proposed absorber consists of a gold layer, a dielectric layer of SiO2, and graphene. The sensing sensitivity of the proposed absorber is simulated for the absence and presence of a square convex nanostructure, trapezoidal convex nanostructure, and rounded convex nanostructure. The sensitivity comparison between convex and absent convex nanostructures is studied, compared to no convex nanostructure, the simulated results show that the sensing sensitivity can be improved with the convex nanostructures, it is found that the absorber has two obvious absorption peaks, and it is insensitive to TE and TM polarization, and the maximum sensitivity corresponding to low-frequency and high-frequency modes is 0.911 THz RIU−1 and 1.561 THz RIU−1, respectively. Our work will play an important role in improving the sensing sensitivity of the graphene metamaterial absorber. Meanwhile, it can also greatly promote the application of biological sensing, modulation, integrated photodetectors, frequency selectors, sensors, filters and so on.
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用图案化凸石墨烯提高超材料吸收器的太赫兹传感灵敏度
本文从理论上设计了一种图案化石墨烯超材料太赫兹吸收器。该吸收器由金层、SiO2 介电层和石墨烯组成。模拟了拟议吸收器在没有和有方形凸状纳米结构、梯形凸状纳米结构和圆形凸状纳米结构时的传感灵敏度。研究了有凸纳米结构和无凸纳米结构的灵敏度比较,与无凸纳米结构相比,仿真结果表明,有凸纳米结构可以提高传感灵敏度,发现吸收体有两个明显的吸收峰,对 TE 和 TM 极化不敏感,低频和高频模式对应的最大灵敏度分别为 0.911 THz RIU-1 和 1.561 THz RIU-1。我们的工作将对提高石墨烯超材料吸波材料的传感灵敏度起到重要作用。同时,它还能极大地促进生物传感、调制、集成光电探测器、选频器、传感器、滤波器等的应用。
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来源期刊
Materials Research Express
Materials Research Express MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
4.50
自引率
4.30%
发文量
640
审稿时长
12 weeks
期刊介绍: A broad, rapid peer-review journal publishing new experimental and theoretical research on the design, fabrication, properties and applications of all classes of materials.
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