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Microtubular structured random lasers as microfluidic channels for multifunctional sensing.

Xiaoyu Shi, Zhe Liu, Jinjiang Zhao

    Optics Letters
    |January 16, 2025
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel microtubule-structured random laser (RL) for enhanced liquid detection. This cost-effective sensor offers fast, simple, and low-volume analysis, overcoming limitations of traditional random lasers.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Analytical Chemistry

    Background:

    • Random lasers (RLs) offer a low-cost platform for analysis but struggle with sensitivity, complex operations, and high analyte consumption for liquid detection.
    • Existing RLs face challenges in sensitivity, operational simplicity, and sample volume requirements for effective liquid sensing applications.

    Purpose of the Study:

    • To develop a microtubule-structured random laser (RL) for multifunctional sensing, inspired by microfluidic sensor designs.
    • To enhance the sensitivity and efficiency of random laser-based liquid detection systems.

    Main Methods:

    • Fabrication of a random laser using a curly polymethyl methacrylate (PMMA) film embedded with gain and scattering elements.
    • Coupling high-order whispering-gallery modes (WGMs) with weak random scattering modes to achieve a coherent random laser.
    • Demonstration of sensing capabilities using sucrose solutions and titanium dioxide nanoparticle (TiO2 NP) suspensions as representative analytes.

    Main Results:

    • Achieved a coherent random laser with a low threshold of 0.62 MW cm⁻² and a high quality (Q) factor of 4700.
    • The random laser sensor demonstrated fast detection, ease of operation, and low cost.
    • Sensing performance correlated with variations in gain and scattering properties in response to different analytes.

    Conclusions:

    • The developed microtubule-structured random laser sensor offers a promising new approach for liquid detection.
    • This technology addresses key limitations of traditional RLs, including sensitivity and analyte consumption.
    • Potential applications include analytical microfluidic chips and portable analytical instruments.