Design and optimization of a polarization-insensitive terahertz metamaterial absorber for sensing applications

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Photonics and Nanostructures-Fundamentals and Applications Pub Date : 2024-10-09 DOI:10.1016/j.photonics.2024.101314

Neelam Singh , Reshmi Dhara , Sanjeev Yadav

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Abstract

This study presents dual-band Terahertz (THz) metamaterial absorbers (MA) designed with square resonators for sensing applications. The absorber is made up of a plasmonic ring resonator, a middle polyimide layer, and a lower metal plate, which enhances its absorption capabilities. The position of annular strips and patch units is strategically adjusted to tune and optimize the absorber’s performance precisely. The proposed metamaterial (MA) consistently absorbs over 99 % within the frequency range from 1.4 to 2.8 THz at 1.6 THz for peak-1 and 2.3 THz for peak-2. The peaks labeled as ‘f1’ and ‘f2’ have a spectral width of 0.02 THz and high-quality factors (Q-factors) of 23 for peak-1 and 29 for peak-2, respectively. This makes them remarkably sensitive to variations in the environmental refractive index (RI). It is important to observe that the refractive index of most samples falls within the range of 1.0–2.0, highlighting the potential applications of this sensor.

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设计和优化用于传感应用的偏振不敏感太赫兹超材料吸收器

本研究介绍了采用方形谐振器设计的用于传感应用的双频太赫兹（THz）超材料吸收器（MA）。该吸收器由一个等离子体环形谐振器、中间的聚酰亚胺层和下部的金属板组成，从而增强了其吸收能力。通过战略性地调整环形条带和贴片单元的位置，可以精确地调整和优化吸收器的性能。在 1.4 至 2.8 太赫兹的频率范围内，拟议的超材料 (MA) 的吸收率始终保持在 99% 以上，峰值-1 为 1.6 太赫兹，峰值-2 为 2.3 太赫兹。标记为 "f1 "和 "f2 "的峰值的光谱宽度为 0.02 THz，峰值-1 和峰值-2 的高质量系数（Q 系数）分别为 23 和 29。这使得它们对环境折射率 (RI) 的变化非常敏感。值得注意的是，大多数样品的折射率都在 1.0-2.0 范围内，这凸显了该传感器的潜在应用价值。

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来源期刊

Photonics and Nanostructures-Fundamentals and Applications 工程技术-材料科学：综合

CiteScore

5.00

自引率

3.70%

发文量

审稿时长

62 days

期刊介绍： This journal establishes a dedicated channel for physicists, material scientists, chemists, engineers and computer scientists who are interested in photonics and nanostructures, and especially in research related to photonic crystals, photonic band gaps and metamaterials. The Journal sheds light on the latest developments in this growing field of science that will see the emergence of faster telecommunications and ultimately computers that use light instead of electrons to connect components.