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Microbubble end-capped fiber-optic Fabry-Perot sensors.

Ricardo Defas-Brucil, Mildred S Cano-Velázquez, Amado M Velázquez-Benítez

    Optics Letters
    |May 23, 2023
    PubMed
    Summary

    Researchers developed a simple method to create microbubble Fabry-Perot (FP) sensors on optical fibers. These novel sensors demonstrate high sensitivity for temperature and displacement measurements.

    Area of Science:

    • Optoelectronics
    • Materials Science
    • Sensor Technology

    Background:

    • Fabry-Perot (FP) sensors are crucial optical devices.
    • Existing polymer-based FP sensors have limitations in sensitivity and fabrication.
    • Microbubble structures offer potential for enhanced sensor performance.

    Purpose of the Study:

    • To develop a simple and reproducible fabrication technique for microbubble-based FP sensors.
    • To investigate the performance of these sensors for temperature and displacement measurements.
    • To compare the sensitivity of microbubble FP sensors with conventional polymer-capped sensors.

    Main Methods:

    • Depositing polydimethylsiloxane (PDMS) drops containing carbon nanoparticles (CNPs) on optical fiber tips.
    • Generating a microbubble within the PDMS end-cap using a photothermal effect from a laser diode.

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  • Characterizing the sensor's response to temperature variations and physical displacement.

    • Main Results:

    • Successfully fabricated microbubble end-capped FP sensors with reproducible performance.
    • Achieved high temperature sensitivities of up to 790 pm/°C, exceeding conventional sensors.
    • Demonstrated a displacement sensitivity of approximately 5.4 nm/µm.

    Conclusions:

    • The photothermal-induced microbubble formation offers a facile method for creating high-performance FP sensors.
    • Microbubble FP sensors exhibit superior temperature sensitivity compared to standard polymer-capped devices.
    • These sensors show promise for accurate displacement sensing applications.