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

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    A novel dual-beam photothermal system detects crystal violet (CV) traces using a thermal lens effect and self-mixing interference (SMI). This label-free method achieves high sensitivity for CV detection in various research fields.

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    Area of Science:

    • Optics and Photonics
    • Analytical Chemistry
    • Spectroscopy

    Background:

    • Crystal violet (CV) is a widely used dye with applications in biology, environmental monitoring, and pharmaceuticals.
    • Accurate and sensitive detection of CV is crucial for quality control and research.
    • Existing detection methods may require labeling or complex sample preparation.

    Purpose of the Study:

    • To propose and validate a dual-beam photothermal self-mixing interference (SMI) system for sensitive trace detection of crystal violet (CV).
    • To establish the relationship between SMI signal power fluctuations and CV concentration.
    • To demonstrate a label-free, flexible, and highly sensitive method for CV characterization.

    Main Methods:

    • Utilizing a dual-beam optical setup with a pump beam for photothermal excitation and a probe beam for detecting refractive index changes.
    • Inducing a thermal lens effect in the CV solution via pump beam irradiation.
    • Observing self-mixing interference (SMI) when the modulated probe beam returns to the laser cavity.
    • Combining theoretical modeling and experimental measurements to correlate SMI signal power with CV concentration.

    Main Results:

    • The thermo-optic effect in CV solution leads to refractive index changes, causing probe beam deviation and SMI.
    • A linear relationship was established between SMI signal power fluctuations and CV concentration.
    • The system achieved a sensitive detection limit of 8.0×10-8 mol/L at an excitation power of 24 mW.
    • The method demonstrated high sensitivity and flexibility without requiring sample labeling or pretreatment.

    Conclusions:

    • The proposed dual-beam photothermal SMI system offers a sensitive and efficient approach for trace CV detection.
    • This label-free technique provides a valuable tool for CV analysis in biological, environmental, and pharmaceutical applications.
    • The findings guide further development of photothermal SMI systems for substance characterization.