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Refractive index sensor based on plastic optical fiber with tapered structure.

Feng De-Jun, Liu Guan-Xiu, Liu Xi-Lu

    Applied Optics
    |May 3, 2014
    PubMed
    Summary

    This study presents a plastic optical fiber (POF) refractive index sensor. The tapered POF sensor demonstrates high sensitivity for biosensing applications, particularly at 633 nm.

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    Area of Science:

    • Optoelectronics
    • Fiber Optics
    • Chemical Sensing

    Background:

    • Refractive index (RI) sensing is crucial for various applications, including biochemical analysis.
    • Plastic optical fibers (POF) offer advantages like flexibility and cost-effectiveness for sensor development.

    Purpose of the Study:

    • To develop and characterize a novel refractive index sensor utilizing a tapered plastic optical fiber (POF).
    • To evaluate the sensor's performance across different wavelengths and optimize its sensitivity.

    Main Methods:

    • Fabrication of a tapered POF structure for enhanced light-matter interaction.
    • Measurement of transmission loss variations in response to changes in external refractive index (1.33–1.41).
    • Evaluation of sensor sensitivity at three distinct wavelengths (532, 633, and 780 nm).

    Main Results:

    • The sensor demonstrated measurable transmission loss changes with varying refractive indices.
    • The wavelength of 633 nm yielded the highest sensitivity.
    • A biconical sensing structure achieved a sensitivity of 950 μW/RIU at 633 nm with 1 mW launched power.

    Conclusions:

    • The tapered POF refractive index sensor exhibits high sensitivity and simple construction.
    • The sensor shows significant potential for practical applications in the biosensing field.
    • Optimization at 633 nm wavelength enhances sensing capabilities.