Enhanced trace-amount terahertz vibrational absorption spectroscopy using surface spoof polarization in metasurface structures
文献类型： 外文期刊
作者： Li, Xiang-Jun 1 ; Ma, Chan 1 ; Yan, De-Xian 1 ; Guo, Shi-Hui 2 ; Zhang, Le 1 ; Yang, Ji 1 ; Zhao, Yang 1 ; Zhou, Wei-Dong 3 ;
作者机构： 1.China Jiliang Univ, Coll Informat Engn, Key Lab Electromagnet Wave Informat Technol & Met, Hangzhou 310018, Zhejiang, Peoples R China
2.Zhejiang Zhong Huan Detect Co Ltd, Wenzhou 325000, Zhejiang, Peoples R China
3.Zhejiang Acad Agr Sci, Inst Anim Husb & Vet Sci, Hangzhou 310021, Zhejiang, Peoples R China
期刊名称：OPTICS LETTERS （ 影响因子：3.56； 五年影响因子：3.662 ）
ISSN： 0146-9592
年卷期： 2022 年 47 卷 10 期
页码：
收录情况： SCI
摘要： Terahertz (THz) absorption spectroscopy is a powerful tool for molecular label-free fingerprinting, but it faces a formidable hurdle in enhancing the broadband spectral signals in trace-amount analysis. In this paper, we propose a sensing method based on the geometry scanning of metal metasurfaces with spoof surface polarization sharp resonances by numerical simulation. This scheme shows a significant absorption enhancement factor of about 200 times in an ultra-wide terahertz band to enable the explicit identification of various analytes, such as a trace-amount thin lactose film samples. The proposed method provides a new, to the best of our knowledge, choice for the enhancement of wide terahertz absorption spectra, and paves the way for the detection of trace-amount chemical, organic, or biomedical materials in the terahertz regime. (C) 2022 Optica Publishing Group
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