Tunable perfect meta-absorber with high sensitivity for refractive index sensing application

IF 5.4 Q1 CHEMISTRY, ANALYTICAL
Kunye Li, Yu-Sheng Lin
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引用次数: 0

Abstract

An infrared (IR) tunable perfect meta-absorber (TPM) is presented, which is configured of metal-insulator-metal (MIM) structure. The unit cell of the TPM device is composed of two opposite T-shaped and two rod-shaped Au resonators on the reflective mirror layer. The optimized feature size of TPM can achieve perfect absorption and the resonant wavelength can be tuned from blue-shift first and then red-shift by increasing the gap size between two T-shaped resonators continuously. The tuning process of red shift is linear. By changing the distance between two rod-shaped resonators, the TPM device exhibits red shift linearly. Moreover, TPM device shows polarization-dependent characteristic that the main absorption resonance can be attenuated from 100% to 0% by changing polarization angle from 0° to 90° of incident IR light. The resonance of TPM device has an excellent linear relationship with the ambient refractive index, and the sensitivity and maximum figure of merit (FOM) are calculated as 1249 nm/RIU and 21 RIU−1, respectively. These results prove that the design of the proposed TPM device is very suitable for the use of IR sensing, polarization switching, and refractive index sensing applications.

用于折射率传感应用的高灵敏度可调完美元吸收器
本文介绍了一种红外线(IR)可调完美元吸收器(TPM),它采用金属-绝缘体-金属(MIM)结构。TPM 器件的单元由反射镜层上两个相对的 T 形和两个杆形金谐振器组成。TPM 的优化特征尺寸可实现完美吸收,通过不断增大两个 T 形谐振器之间的间隙,谐振波长可从蓝移调谐到红移。红移的调谐过程是线性的。通过改变两个棒状谐振器之间的距离,TPM 器件呈现线性红移。此外,TPM 器件还具有偏振依赖特性,入射红外光的偏振角从 0° 到 90° 变化时,主吸收共振可从 100% 衰减到 0%。TPM 器件的共振与环境折射率呈良好的线性关系,灵敏度和最大优点系数(FOM)分别为 1249 nm/RIU 和 21 RIU-1。这些结果证明,所提出的 TPM 器件设计非常适合用于红外传感、偏振切换和折射率传感应用。
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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来源期刊
Sensing and Bio-Sensing Research
Sensing and Bio-Sensing Research Engineering-Electrical and Electronic Engineering
CiteScore
10.70
自引率
3.80%
发文量
68
审稿时长
87 days
期刊介绍: Sensing and Bio-Sensing Research is an open access journal dedicated to the research, design, development, and application of bio-sensing and sensing technologies. The editors will accept research papers, reviews, field trials, and validation studies that are of significant relevance. These submissions should describe new concepts, enhance understanding of the field, or offer insights into the practical application, manufacturing, and commercialization of bio-sensing and sensing technologies. The journal covers a wide range of topics, including sensing principles and mechanisms, new materials development for transducers and recognition components, fabrication technology, and various types of sensors such as optical, electrochemical, mass-sensitive, gas, biosensors, and more. It also includes environmental, process control, and biomedical applications, signal processing, chemometrics, optoelectronic, mechanical, thermal, and magnetic sensors, as well as interface electronics. Additionally, it covers sensor systems and applications, µTAS (Micro Total Analysis Systems), development of solid-state devices for transducing physical signals, and analytical devices incorporating biological materials.
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