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Graphene enhanced evanescent field in microfiber multimode interferometer for highly sensitive gas sensing.

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    Graphene enhances evanescent fields in a novel fiber optic sensor. This graphene-coated microfiber interferometer achieves ultra-high sensitivity for detecting ammonia and water vapor, enabling trace analysis.

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    Area of Science:

    • Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Graphene exhibits unique physical properties driving innovation in photonic devices.
    • Evanescent fields in optical fibers are crucial for sensing applications.

    Purpose of the Study:

    • To investigate the enhancement of surface evanescent fields using graphene cylindrical cladding.
    • To develop a highly sensitive graphene-based all-fiber gas sensor.

    Main Methods:

    • Utilizing a graphene-coated microfiber multi-mode interferometer (GMMI).
    • Theoretical modeling and experimental verification of evanescent field enhancement.
    • Gas sensing experiments for ammonia (NH3) and water vapor (H2O) detection.

    Main Results:

    • Demonstrated significant enhancement of evanescent fields by graphene cladding.
    • Achieved ultra-high sensitivities: ~0.1 ppm for NH3 and ~0.2 ppm for H2O.
    • Verified theoretical predictions experimentally.

    Conclusions:

    • Graphene cladding effectively enhances evanescent fields in hybrid waveguides.
    • The GMMI sensor offers a promising platform for trace gas analysis.
    • This approach paves the way for novel, compact, low-cost, and temperature-immune graphene-based all-fiber devices.