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Reflectivity enhanced refractive index sensor based on a fiber-integrated Fabry-Perot microresonator.

T Wieduwilt, J Dellith, F Talkenberg

    Optics Express
    |November 18, 2014
    PubMed
    Summary

    This study presents a fiber-integrated refractive index sensor with enhanced detection performance using focused-ion beam milling. Coating resonator walls significantly boosted mirror reflectivity, optimizing it as a Fabry-Perot resonator for improved sensing capabilities.

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    Area of Science:

    • Photonics and Optical Sensing
    • Materials Science and Engineering
    • Nanotechnology

    Background:

    • Refractive index sensors are crucial for various applications, including chemical detection and biomedical diagnostics.
    • Existing fiber-integrated sensors often face limitations in sensitivity and detection performance.
    • Fabry-Perot resonators offer a promising platform for high-performance optical sensing.

    Purpose of the Study:

    • To develop and characterize a fiber-integrated refractive index sensor with significantly improved detection performance.
    • To investigate the impact of resonator wall coating on sensor performance.
    • To provide design rules and mathematical analysis for optimizing such sensors.

    Main Methods:

    • Implementation of a resonator using focused-ion beam milling of a step index fiber.
    • Coating of resonator walls to enhance mirror reflectivity.
    • Mathematical analysis and derivation of design rules for sensor optimization.

    Main Results:

    • Achieved a sensitivity of approximately 1.15 µm/RIU for the refractive index sensor.
    • Demonstrated a significant improvement in mirror reflectivity by a factor of approximately 26 through resonator wall coating.
    • Confirmed the sensor operates as an optimized Fabry-Perot resonator.

    Conclusions:

    • The developed fiber-integrated sensor exhibits strongly improved detection performance.
    • Coating resonator walls is an effective strategy for enhancing mirror reflectivity and overall sensor performance.
    • The performance of Fabry-Perot sensors is fundamentally limited by the detection limit function, influenced by cavity finesse and measurement capabilities.