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Modal interferometric refractive index sensing in microstructured exposed core fibres.

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    This study introduces a novel optical fibre sensor for precise physiological monitoring. The exposed-core fibre (ECF) sensor offers high sensitivity for detecting subtle changes in bodily fluids and tissues.

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    Area of Science:

    • Biomedical Engineering
    • Optical Sensing
    • Materials Science

    Background:

    • Optical fibre sensors offer accurate physiological process monitoring.
    • Existing sensors face challenges in sensitivity and accessibility for in-vivo applications.

    Purpose of the Study:

    • To develop a novel refractive index sensor based on microstructured exposed-core fibre (ECF).
    • To achieve robust interferometric sensing with high sensitivity for physiological measurements.

    Main Methods:

    • Modelling of a microstructured exposed-core fibre (ECF) with a high refractive index coating.
    • Utilizing a two-mode, one-fibre solution with an isolated reference mode.
    • Interferometric sensing to measure refractive index shifts.

    Main Results:

    • Demonstrated splitting of the guided mode into a surface sensing mode and an isolated reference mode.
    • Achieved high sensitivity of up to 60,000 rad/RIU-cm.
    • The sensor design enables robust interferometric measurements.

    Conclusions:

    • The proposed ECF sensor is a versatile and accurate probe for physiological processes.
    • This technology is suitable for sensing subtle changes in hard-to-reach internal body locations.
    • The two-mode, one-fibre approach enhances sensing robustness and sensitivity.