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All optic-fiber coupled plasmon waveguide resonance sensor using ZrS2 based dielectric layer.

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    We created a novel optical fiber sensor using zirconium disulfide (ZrS2) for precise refractive index measurements. This plasmon waveguide resonance sensor achieved high sensitivity, exceeding 8000 nm/RIU.

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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Optical Sensors

    Background:

    • Plasmon waveguide resonance (PWR) sensors offer high sensitivity for detecting changes in refractive index.
    • Zirconium disulfide (ZrS2) is an emerging material with unique optical properties suitable for sensor applications.
    • Developing all-fiber optic sensors enhances device robustness and simplifies integration.

    Purpose of the Study:

    • To develop and characterize an all-optic-fiber coupled plasmon waveguide resonance (CPWR) sensor.
    • To utilize zirconium disulfide (ZrS2) as the active dielectric layer in the CPWR sensor.
    • To optimize the sensor design and evaluate its performance for refractive index sensing.

    Main Methods:

    • First-principles calculations were performed to determine the dielectric constants of ZrS2.
    • A theoretical model based on the transfer matrix method was established and used for sensor parameter optimization.
    • The CPWR sensor was fabricated by depositing a 35 nm gold layer on the fiber core, followed by physical adsorption of the ZrS2 layer.
    • An experimental setup was implemented to measure the sensor's response to changes in refractive index.

    Main Results:

    • The dielectric constants of ZrS2 were theoretically determined.
    • The theoretical model facilitated the optimization of sensor parameters.
    • The fabricated sensor, particularly with two cycles of ZrS2 deposition, demonstrated optimal performance.
    • A high sensitivity exceeding 8000 nm/RIU was achieved.

    Conclusions:

    • An all-optic-fiber CPWR sensor utilizing a ZrS2 dielectric layer was successfully developed.
    • The sensor exhibits excellent sensitivity for refractive index measurements.
    • The findings highlight the potential of ZrS2-based materials in advanced optical sensing applications.