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Microfiber sensor probe integrated with a cascaded Fabry-Perot interferometer.

Qi Chen, Feng Gao, Zhaokun Wang

    Applied Optics
    |October 6, 2021
    PubMed
    Summary
    This summary is machine-generated.

    We developed a novel microfiber sensor probe (MSP) using femtosecond laser technology. This micro-sensor enables precise measurements in microenvironments, showing high sensitivity for refractive index and temperature changes.

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    Area of Science:

    • Optical Fiber Sensing
    • Microfabrication
    • Nanotechnology

    Background:

    • Micro-nanometer optical fiber sensors are crucial for microenvironment analysis.
    • Existing methods face challenges in sensitivity and integration.

    Purpose of the Study:

    • To propose a new strategy for fabricating microfiber sensor probes (MSPs).
    • To demonstrate the application of MSPs in microenvironments for sensing.
    • To analyze the performance and sensitivity of the fabricated MSPs.

    Main Methods:

    • Fabrication of a silica microfiber sensor probe (MSP) using femtosecond laser integration.
    • Integration of cascaded Fabry-Perot interferometers (FPIs) into the microfiber.
    • Experimental characterization of MSP diameter, extinction ratio, fitness, and Q-factor.
    • Application of MSP for refractive index and thermal measurements.
    • Spectral analysis using a two-beam approximation model and simulation.

    Main Results:

    • Demonstrated an 8µm diameter MSP with a 15 dB extinction ratio, 24.6 fitness, and 2310 Q-factor.
    • Achieved a thermal sensitivity of 10 pm/°C and refractive index sensitivity of 18.5 nm/RIU.
    • Simulations revealed the influence of fiber size on refractive index sensitivity.

    Conclusions:

    • The proposed femtosecond laser-based fabrication is effective for creating high-performance MSPs.
    • The demonstrated MSPs are suitable for sensitive measurements in microenvironments.
    • Further research can optimize MSP design for enhanced sensing capabilities.