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Highly scalable solid-core inhibited-coupling fiber-based plasmonic refractive index sensor.

Mohammad Al Mahfuz, Md Selim Habib

    Optics Express
    |January 29, 2025
    PubMed
    Summary

    We developed a novel solid-core fiber sensor for ultra-broad range refractive index (RI) detection. This plasmonic sensor achieves high sensitivity and low loss, enabling applications in environmental monitoring and bio-sensing.

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    Area of Science:

    • Photonics and Optical Sensing
    • Nanotechnology
    • Materials Science

    Background:

    • Advancements in plasmonic sensing necessitate simultaneous detection with large-scale capabilities and minimal signal loss.
    • Existing sensors often face limitations in detection range and sensitivity.

    Purpose of the Study:

    • To propose and investigate a novel solid-core fiber-based refractive index (RI) sensor.
    • To achieve an ultra-broad detection range with high sensitivity and low loss.

    Main Methods:

    • Utilized finite-element modeling (FEM) to combine inhibited-coupling (IC) and surface plasmon resonance (SPR) sensing mechanisms.
    • Investigated sensing performance across a refractive index range of 1 to 1.60.
    • Analyzed fabrication tolerance, bending effects, and alternative plasmonic materials.

    Main Results:

    • Demonstrated a low signal loss of <3 dB/cm over the entire RI detection range.
    • Achieved a peak wavelength sensitivity (WS) of 3000 nm/RIU.
    • Obtained a figure of merit (FOM) of 120 RIU-1.

    Conclusions:

    • The proposed sensor offers an ultra-broad detection range and high performance, suitable for practical implementation.
    • Potential applications include detecting air pollutants, biochemical substances, and DNA on a lab-on-a-chip platform.
    • This work paves the way for advanced bio-sensing technologies.