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SPR sensor based on Bessel-like beam.

Zhihai Liu, Wei Liu, Bin Lai

    Optics Express
    |June 22, 2021
    PubMed
    Summary
    This summary is machine-generated.

    This study enhances fiber-based surface plasma resonance (SPR) sensors using a Bessel-like beam, achieving higher sensitivity for refractive index (RI) detection. The novel approach with concentric rings in the beam improves SPR sensor performance.

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    Area of Science:

    • Photonics and Optical Sensing
    • Nanotechnology
    • Materials Science

    Background:

    • Surface Plasma Resonance (SPR) sensors are crucial for detecting changes in refractive index (RI).
    • Traditional SPR sensors often face limitations in sensitivity and performance.
    • Enhancing SPR sensor sensitivity is vital for various applications, including chemical and biological detection.

    Purpose of the Study:

    • To experimentally investigate the enhancement of sensitivity in a fiber-based SPR RI sensor.
    • To explore the use of a Bessel-like beam as an input source for improved SPR sensing.
    • To optimize the sensor's performance by controlling the characteristics of the Bessel-like beam.

    Main Methods:

    • A fiber-based SPR sensor was constructed by splicing single-mode and multimode fibers to generate a Bessel-like beam.
    • A dual-truncated-cone (DTC) fiber structure was fabricated to excite and receive SPR signals.
    • The number of concentric rings in the Bessel-like beam, determined by multimode fiber length, was varied to influence sensitivity.

    Main Results:

    • The Bessel-like beam, featuring concentric rings, was shown to improve resonance angle configuration consistency.
    • A maximum average sensitivity of 6908.3 nm/RIU was achieved with a 15° grinding angle and 500 µm multimode fiber length.
    • The proposed Bessel-like beam SPR sensor demonstrated higher sensitivity compared to sensors using a Gaussian beam.

    Conclusions:

    • The use of a Bessel-like beam significantly enhances the sensitivity of fiber-based SPR RI sensors.
    • The number of concentric rings in the Bessel-like beam directly correlates with improved sensor sensitivity.
    • This method offers a promising pathway for developing next-generation, high-sensitivity optical sensors.