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Highly sensitive optofluidic refractive index sensor based on a seven-liquid-core Teflon-cladding fiber.

Jiang-Tao Dong, Chang-He Cheng, Chuang Wu

    Optics Express
    |September 10, 2020
    PubMed
    Summary

    We developed a highly sensitive optofluidic sensor using a liquid-filled fiber. This novel refractive index (RI) sensor achieves a sensitivity of 25,300 nm/RIU, enabling precise liquid analysis.

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    Area of Science:

    • Optofluidics
    • Fiber optics
    • Sensing technology

    Background:

    • Refractive index (RI) sensing is crucial for various applications.
    • Existing sensors face limitations in sensitivity and integration.
    • Optofluidic devices offer potential for enhanced sensing capabilities.

    Purpose of the Study:

    • To propose and theoretically demonstrate a novel optofluidic refractive index sensor.
    • To achieve high sensitivity and accuracy in liquid RI measurements.
    • To investigate the influence of structural parameters on sensor performance.

    Main Methods:

    • Utilized a liquid-filled seven-hole Teflon-cladding fiber segment as a spectral filter.
    • Employed coupled-mode theory and finite-element method for numerical simulation.
    • Analyzed the spectral response to changes in liquid refractive index.

    Main Results:

    • Demonstrated light guidance within liquid cores via total internal reflection.
    • Achieved wavelength-dependent coupling, creating a filter spectrum.
    • Obtained a high RI sensitivity of 25,300 nm/RIU around RI=1.333.
    • Studied the impact of air hole diameter and pitch on RI sensitivity.

    Conclusions:

    • The proposed optofluidic sensor exhibits excellent sensitivity for refractive index detection.
    • The design is adaptable, with performance tunable via structural modifications.
    • This technology holds promise for advanced liquid analysis and monitoring.