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Dual-beam photothermal material trace detection method based on self-mixing interference

文献类型： 外文期刊

作者： Zhao, Yan 1 ; Zhi, Yunlong 1 ; Zhao, Hui 1 ; Dong, Daming 1 ; Tong, Jigang 1 ; Tu, Chunling 4 ;

作者机构： 1.Tianjin Univ Technol, Sch Elect Engn & Automat, Tianjin 300384, Peoples R China

2.Tianjin Key Lab Control Theory & Applicat Complica, Tianjin 300384, Peoples R China

3.Beijing Acad Agr & Forestry Sci, Natl Res Ctr Intelligent Equipment Agr, Beijing 100097, Peoples R China

4.Tshwane Univ Technol, Fac ICT, Dept Comp Syst Engn, ZA-0188 Pretoria, South Africa

期刊名称：APPLIED OPTICS （ 影响因子：1.7； 五年影响因子：1.7 ）

ISSN： 1559-128X

年卷期： 2025 年 64 卷 16 期

页码：

收录情况： SCI

摘要： In this paper, a dual-beam photothermal self-mixing substance trace detection system is proposed. The crystal violet (CV) solution of the sample undergoes a thermal lens effect under the action of pump photoperiod excitation, and the refractive index changes cause the deviation of the probe beam, and the self-mixing interference (SMI) effect occurs when the modulated light returns to the cavity. By combining theoretical and experimental results, the power fluctuation of the SMI signal caused by the thermo-optic effect is linearly related to CV concentration and other parameters. At an excitation power of 24 mW, the detection limit can reach 8.0 x 10-8 mol/L. This method does not require labeling or complex CV pretreatment and has high sensitivity and flexibility, providing a guide for CV characterization in biological, environmental, and pharmaceutical research. (c) 2025 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.

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