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High-precision micro-displacement optical-fiber sensor based on surface plasmon resonance.

Zongda Zhu, Lu Liu, Zhihai Liu

    Optics Letters
    |May 16, 2017
    PubMed
    Summary

    This study introduces a novel optical-fiber sensor for micro-displacement measurement using surface plasmon resonance (SPR). The sensor achieves high sensitivity and nanometer resolution, offering a significant advancement for industrial applications.

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    Area of Science:

    • Optoelectronics
    • Fiber Optics Sensing
    • Nanotechnology

    Background:

    • Surface Plasmon Resonance (SPR) is a sensitive optical phenomenon used for detecting changes in refractive index.
    • Traditional SPR sensors often face limitations in sensitivity, range, and practical application.
    • Optical fiber sensors offer advantages in remote sensing and miniaturization.

    Purpose of the Study:

    • To develop and demonstrate a novel micro-displacement sensor utilizing SPR in a graded-index multimode fiber (GIMMF).
    • To investigate the sensor's performance characteristics, including detection range, sensitivity, and resolution.
    • To explore methods for enhancing sensor sensitivity.

    Main Methods:

    • Fabrication of a Kretschmann configuration on GIMMF.
    • Utilizing a single-mode fiber to alter the incident beam's radial position, correlating with displacement.
    • Analyzing the shift in resonance wavelength due to displacement-induced changes in the angle between the light beam and fiber axis.

    Main Results:

    • Demonstrated a micro-displacement fiber sensor with a detection range of 0-25 μm.
    • Achieved high sensitivity, reaching up to 10.32 nm/μm.
    • Obtained a nanometer resolution, with a minimum of 2 nm, surpassing existing optical-fiber micro-displacement sensors.

    Conclusions:

    • The developed GIMMF-SPR sensor offers a wide detection range, high sensitivity, and nanometer resolution for micro-displacement measurement.
    • Increasing the fiber polishing angle or medium refractive index can further enhance sensor sensitivity.
    • This sensor provides a novel, rapid, and accurate optical measurement method with significant potential for industrial applications.