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Two-core transversally chirped microstructured optical fiber refractive index sensor.

Pedro Torres, Erick Reyes-Vera, Antonio Díez

    Optics Letters
    |April 3, 2014
    PubMed
    Summary

    We developed a novel optical fiber sensor for fluid refractive index detection. This microstructured optical fiber (MOF) acts as a Mach-Zehnder interferometer, offering high sensitivity for various fluid analytes.

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    Area of Science:

    • Photonics and Optical Sensing
    • Materials Science
    • Interferometry

    Background:

    • Microstructured optical fibers (MOFs) offer unique light-guiding properties.
    • Mach-Zehnder interferometers are sensitive to changes in the optical path.
    • Refractive index sensing is crucial for chemical and biological analysis.

    Purpose of the Study:

    • To present a new sensing architecture using a chirped MOF for fluid refractive index sensing.
    • To demonstrate the Mach-Zehnder interferometer behavior in a two-core MOF.
    • To evaluate the sensitivity and potential range of the developed sensor.

    Main Methods:

    • Fabrication of a two-core chirped microstructured optical fiber.
    • Utilizing the MOF as a Mach-Zehnder interferometer with decoupled cores.
    • Modulating transmittance by differential influence of the analyte on core effective refractive indices.
    • Filling all fiber holes with the analyte for sensing.

    Main Results:

    • The chirped MOF structure enables decoupled cores, forming an interferometer.
    • Analyte refractive index directly modulates device transmittance.
    • Achieved high sensitivity of 300 transmittance changes per refractive index unit (RIU) at n=1.42.
    • Demonstrated potential for sensing over a wide range of analyte refractive indices.

    Conclusions:

    • The chirped MOF architecture is effective for sensitive refractive index sensing.
    • The device functions as a Mach-Zehnder interferometer for fluid analysis.
    • This sensing platform shows promise for diverse applications requiring precise refractive index measurements.