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Signal processing assisted Vernier effect in a single interferometer for sensitivity magnification.

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    Summary
    This summary is machine-generated.

    This study introduces a single interferometer method to achieve the Vernier effect, enhancing optical sensitivity. This novel approach uses an artificial reference spectrum for ultrahigh sensitivity in sensing applications.

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    Area of Science:

    • Optics and Photonics
    • Interferometry
    • Sensing Technology

    Background:

    • The Vernier effect traditionally requires two separate interferometers (sensing and reference) to magnify optical sensitivity.
    • Existing methods face limitations in complexity and environmental stability for achieving ultrahigh sensitivity.

    Purpose of the Study:

    • To demonstrate a simplified method for achieving the Vernier effect using a single interferometer.
    • To develop an artificial reference spectrum (ARS) for enhanced optical sensing.
    • To achieve ultrahigh sensitivity in refractive index (RI) sensing.

    Main Methods:

    • Implemented a single interferometer capable of generating an artificial reference spectrum (ARS).
    • Utilized spatial frequency down-conversion for ARS extraction, ensuring environmental stability.
    • Designed a Mach-Zehnder (MZ) interferometer with a dual-mode microfiber for refractive index sensing.

    Main Results:

    • Successfully demonstrated the Vernier effect within a single interferometer system.
    • Achieved a high refractive index sensitivity of 71354.58 nm/RIU.
    • Observed good linearity in the sensing measurements.

    Conclusions:

    • The single-interferometer approach with ARS provides a simpler, accurate, and ultrahigh-sensitivity method for optical sensing.
    • This technique overcomes the limitations of traditional dual-interferometer Vernier setups.
    • The developed MZ interferometer shows significant potential for high-precision refractive index measurements.