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Highly sensitive surface plasmon resonance sensor utilizing a long period grating with photosensitive cladding.

Zhihong Li, Tao Chen, Zhaogang Zhang

    Applied Optics
    |February 25, 2016
    PubMed
    Summary

    This study introduces a novel silver-coated fiber grating sensor for enhanced surface plasmon resonance (SPR) detection. This new grating-assisted SPR platform achieves significantly higher sensitivity and resolution for refractive index sensing.

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    Area of Science:

    • Photonics and optical sensing technologies.
    • Fiber optic sensor development.
    • Surface Plasmon Resonance (SPR) applications.

    Background:

    • Conventional Surface Plasmon Resonance (SPR) sensors face limitations in sensitivity and resolution.
    • Long Period Fiber Gratings (LPFGs) offer potential for enhanced optical sensing.
    • Photosensitive cladding in fiber gratings can modulate SPR characteristics.

    Purpose of the Study:

    • To propose and investigate a novel grating-assisted SPR sensor.
    • To explore the use of a silver-coated long period fiber grating with a photosensitive cladding (C-LPFG).
    • To evaluate the sensitivity and resolution of the proposed C-LPFG-based SPR sensor compared to conventional SPR sensors.

    Main Methods:

    • Fabrication of a silver-coated long period fiber grating with a photosensitive cladding (C-LPFG).
    • Investigation of the SPR mode transition and its dependence on the surrounding refractive index (SRI).
    • Numerical simulations to optimize sensor performance by reducing fiber diameter.

    Main Results:

    • The C-LPFG-based SPR sensor exhibits SPR mode transition from higher EH modes, highly sensitive to SRI changes.
    • Significantly higher sensitivity achieved compared to conventional SPR sensors.
    • Maximum local sensitivity of ~4900 nm/RIU and resolution of ~2.04×10⁻⁶ RIU demonstrated for reduced silver-coated C-LPFG.

    Conclusions:

    • The novel C-LPFG-based SPR platform offers superior sensitivity and resolution for refractive index sensing.
    • Reducing the fiber diameter further enhances the sensor's performance.
    • The C-LPFG-based SPR platform shows significant potential for future biochemical sensing applications.