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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Multimode fiber surface plasmon resonance sensor based on a down-up taper.

Bingjie Jin, D N Wang

    Optics Letters
    |October 14, 2022
    PubMed
    Summary

    This study presents a novel fiber optic sensor for precise refractive index measurement. The compact device demonstrates high sensitivity and robustness, offering potential for advanced biological and chemical sensing applications.

    Area of Science:

    • Optoelectronics
    • Nanotechnology
    • Chemical Sensing

    Background:

    • Surface Plasmon Resonance (SPR) sensors are crucial for detecting changes in refractive index.
    • Traditional SPR sensors often face limitations in sensitivity, size, and robustness.

    Purpose of the Study:

    • To propose and demonstrate a novel multimode fiber SPR sensor.
    • To enhance measurement sensitivity and device robustness for refractive index sensing.

    Main Methods:

    • Fabrication of a down-up taper structure using multimode fibers.
    • Deposition of a Chromium (Cr) + Silver (Ag) layer via magnetron sputtering.
    • Characterization of the sensor's performance for refractive index measurement.

    Main Results:

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    • Achieved a high refractive index sensitivity of approximately 3264.01 nm/RIU within the 1.345-1.375 range.
    • The sensor exhibits a compact size (approx. 2.75 mm length) and improved robustness due to a larger waist diameter (40 µm).

    Conclusions:

    • The down-up taper multimode fiber SPR sensor offers enhanced sensitivity and robustness.
    • The device shows significant potential for practical applications in biological and chemical sensing.