Enhanced trace-amount terahertz vibrational absorption spectroscopy using surface spoof polarization in metasurface structures

文献类型： 外文期刊

第一作者： Li, Xiang-Jun

作者： Li, Xiang-Jun;Ma, Chan;Yan, De-Xian;Zhang, Le;Yang, Ji;Zhao, Yang;Li, Xiang-Jun;Yan, De-Xian;Guo, Shi-Hui;Zhou, Wei-Dong

作者机构：

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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