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Highly sensitive refractive index sensor based on plastic optical fiber balloon structure.

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    A new plastic optical fiber (POF) sensor uses a balloon structure to detect sodium chloride concentrations. This novel design offers high sensitivity and potential applications in various safety sensing fields.

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    Area of Science:

    • Optoelectronics
    • Chemical Sensing
    • Materials Science

    Background:

    • Refractive index sensing is crucial for chemical analysis.
    • Plastic optical fibers (POFs) offer advantages in sensor fabrication.
    • Developing sensitive and robust refractive index sensors remains an active research area.

    Purpose of the Study:

    • To propose and experimentally investigate a novel plastic optical fiber (POF) balloon-based sensor.
    • To evaluate the sensor's performance in detecting varying concentrations of sodium chloride.
    • To demonstrate the sensor's sensitivity and robustness for practical applications.

    Main Methods:

    • Fabrication of a plastic optical fiber (POF) balloon structure.
    • Experimental characterization of the sensor's response to refractive index changes.
    • Analysis of transmission loss as a function of analyte concentration.

    Main Results:

    • The sensor exhibits high sensitivity (3105 RIU-1) and resolution (3.22 ×10-7) for sodium chloride detection.
    • A high linear performance (0.9896) and good robustness against fabrication imperfections were achieved.
    • Optimal performance was observed at 680 nm for a POF balloon diameter of 0.1 cm.

    Conclusions:

    • The developed POF balloon-based sensor is highly sensitive to refractive index changes.
    • The sensor demonstrates significant potential for applications in chemical, biological, and food safety sensing.
    • The simple design and robust performance make it suitable for various analytical challenges.