Highly boosted trace-amount terahertz vibrational absorption spectroscopy based on defect one-dimensional photonic crystal

文献类型： 外文期刊

第一作者： Yan, De-xian

作者： Yan, De-xian;Wang, Zi-hao;LI, Xiang-jun;Zhang, L. E.;Yan, De-xian;Wang, Zi-hao;LI, Xiang-jun;Zhang, L. E.;Zhou, Wei-dong;LI, Ji-ning

作者机构：

期刊名称：OPTICS LETTERS （ 影响因子：3.6； 五年影响因子：3.5 ）

ISSN： 0146-9592

年卷期： 2023 年 48 卷 7 期

页码：

收录情况： SCI

摘要： Although terahertz (THz) spectroscopy demonstrates great application prospects in the fields of fingerprint sensing and detection, traditional sensing schemes face unavoidable lim-itations in the analysis of trace-amount samples. In this Letter, a novel, to the best of our knowledge, absorption spectroscopy enhancement strategy based on a defect one-dimensional photonic crystal (1D-PC) structure is proposed to achieve strong wideband terahertz wave-matter interac-tions for trace-amount samples. Based on the Fabry-Perot resonance effect, the local electric field in a thin-film sam-ple can be boosted by changing the length of the photonic crystal defect cavity, so that the wideband signal of the sample fingerprint can be greatly enhanced. This method exhibits a great absorption enhancement factor, of about 55 times, in a wide terahertz frequency range, facilitating the identification of different samples, such as thin alpha-lactose films. The investigation reported in this Letter provides a new research idea for enhancing the wide terahertz absorp-tion spectroscopy of trace samples. (c) 2023 Optica Publishing Group

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