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Refractometric sensors based on multimode interference in a thin-film coated single-mode-multimode-single-mode

Ignacio Del Villar, Abian B Socorro, Jesus M Corres

    Applied Optics
    |July 1, 2014
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    Summary

    Researchers enhanced a single-mode-multimode-single-mode (SMS) fiber sensor for refractive index detection. Optimized thin-film coatings and multimode segment diameters significantly improved sensitivity, achieving a seven-fold increase.

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    Area of Science:

    • Optoelectronics
    • Fiber optics sensing
    • Nanomaterials

    Background:

    • Thin-film coated single-mode-multimode-single-mode (SMS) structures are utilized for refractive index sensing.
    • Optimization of structural parameters is crucial for enhancing sensor sensitivity.

    Purpose of the Study:

    • To theoretically and experimentally analyze thin-film coated SMS structures for refractive index detection.
    • To improve the sensitivity of SMS fiber sensors to the surrounding medium's refractive index.

    Main Methods:

    • Analysis of thin-film coated SMS structures.
    • Experimental investigation of sensor performance.
    • Optimization of thin-film thickness and multimode segment diameter.
    • Layer-by-layer self-assembly for thin-film deposition.

    Main Results:

    • Achieved a seven-fold improvement in sensitivity to refractive index.
    • Maximum sensitivity reached 1199.18 nm/refractive index unit for the 1.321-1.382 RI range.
    • Layer-by-layer self-assembly enhanced reflected power, eliminating the need for a mirror.

    Conclusions:

    • Optimized thin-film coated SMS structures offer highly sensitive refractive index sensing.
    • The developed method provides a robust and mirror-free approach for fiber optic sensing applications.