用于气体传感和折射率检测的三波段超材料吸收器，在太赫兹系统中增强了 FOM 和 Q 因子性能

IF 3 Q3 Physics and Astronomy

Results in Optics Pub Date : 2025-04-05 DOI:10.1016/j.rio.2025.100822

Md. Murad Kabir Nipun , Md. Jahedul Islam , Md. Moniruzzaman

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引用次数: 0

摘要

本文讨论了一种带有外裂圆对称超材料吸收体的新型微排列三带互联椭圆形裂环。该设计包含三层，其中铅玻璃夹在两层铜层之间作为谐振器的表面和地面，通过太赫兹频谱分析具有很强的识别不同气体传感折射率变化的能力。该吸收器的工作频率为9 ~ 10太赫兹（THz），其中三个吸收峰分别在9.42 （f1）、9.86 （f2）和10.03 （f3）太赫兹处具有99.95%、96.42%和99.98%的吸收率。所提出的MMA的优点系数（FOM）分别为15.45、23.82和29.87，显示出越来越高的传感应用，并能精确识别折射率的微小变化。为了测量灵敏度，折射率(n)在1到1.05之间变化，结果为每折射率单位2.016,2.556和1.41太赫兹，这些值表明探测折射率微小变化的有效灵敏度。该三波段综合综合指数的质量因子（q因子）分别为72.53、92.11和213.24，表明其精度较高，能够更好地发现和响应环境中的微小变化。该MMA具有对称结构，具有很强的极化独立性。为了探索这种独特的MMA的吸收和灵敏度特性，进行了表面电流、不同气体层数等参数模拟，并分析了介电常数和渗透率。总体而言，该MMA显示了多功能性，具有出色的FOM值和q因子，使其成为宽带传感和高精度传感的可靠选择。这种对折射率变化作出反应的能力使其成为环境监测、临床检查和化学传感等领域传感应用的杰出候选者。

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A triple-band metamaterial absorber for gas sensing and refractive index detection through enhanced FOM and Q-factor performance in the THz regime

In this paper, a new micro-arranged triple band interconnected oval-shaped split ring with an external split circle symmetrical metamaterial absorber (MMA) is discussed. This design contains three layers where lead glass is sandwiched between two copper layers as a resonator surface and ground, which has a strong ability to identify the variation of refractive index for different gas sensing through THz frequency spectral analysis. The working frequency of the proposed absorber is 9 to 10 terahertz (THz) where the three absorption peaks are having 99.95%, 96.42%, and 99.98% absorptions at 9.42 (f1), 9.86 (f2), and 10.03 (f3) THz, respectively. The figure of merit (FOM) of the proposed MMA having value of 15.45, 23.82, and 29.87shows progressively higher sensing application and precisely identify small changes in refractive index. To measure the Sensitivity, refractive index (n) has been varied from 1 to 1.05 and the results are 2.016, 2.556 and 1.41 THz per refractive index unit where these values indicate an effective sensitivity for detecting small changes in refractive index. The quality factors (Q-factors) of this triple band MMA are 72.53, 92.11, and 213.24 indicating sophisticated accuracy and better capability to spot and respond to minute changes in its environment. This MMA shows a great polarization independency as it has symmetrical construction. To explore the absorption and sensitivity property of this unique MMA, several parametric simulations have been done such as surface current, different gas layers and in addition permittivity and permeability are also analyzed. As a whole, this MMA shows versatility, with excellent FOM values and Q-factors, making it a reliable option for both wide-band sensing as well as high-precision sensing. This ability to react to changes in refractive index makes it a brilliant candidate for sensing applications in fields such as environmental monitoring, clinical examination, and chemical sensing.

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