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Plasmonic tapered-fiber interference sensor for simultaneously detecting refractive index and temperature.

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    Optics Letters
    |December 16, 2021
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    Summary

    This study introduces a novel single-optic-fiber sensor for simultaneous refractive index (RI) and temperature (T) detection. The sensor leverages combined Mach-Zehnder interference (MZI) and surface plasmon resonance (SPR) for enhanced sensitivity and simplified detection systems.

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    Area of Science:

    • Photonics and optical sensing
    • Biochemical sensing technologies
    • Nanomaterials for sensing applications

    Background:

    • Simultaneous measurement of refractive index (RI) and temperature (T) is crucial for many biochemical and environmental monitoring applications.
    • Existing sensors often require complex systems or lack sensitivity for precise measurements.
    • Integrating multiple sensing mechanisms into a single platform can enhance performance and simplify instrumentation.

    Purpose of the Study:

    • To propose and demonstrate a single-optic-fiber sensor capable of simultaneously detecting refractive index (RI) and temperature (T).
    • To enhance the refractive index sensitivity compared to conventional fiber optic sensors.
    • To develop a simplified and integrated sensing system for potential portable applications.

    Main Methods:

    • A single-optic-fiber sensor was designed utilizing a tapered-fiber structure to excite Mach-Zehnder interference (MZI).
    • A 45 nm gold film was deposited on the tapered fiber to stimulate surface plasmon resonance (SPR).
    • Fast Fourier Transform (FFT) and filter processing were employed to separate the superimposed MZI and SPR signals.

    Main Results:

    • The sensor successfully achieved simultaneous detection of RI and T at a single wavelength band.
    • Refractive index sensitivity was significantly improved to 2021.07 nm/RIU, a 21-fold enhancement over the original MZI sensor.
    • The combined MZI and SPR approach allowed for the separation and analysis of both sensing signals.

    Conclusions:

    • The proposed single-optic-fiber sensor effectively integrates MZI and SPR for enhanced RI sensing and simultaneous T detection.
    • This integrated sensor design simplifies the overall detection system, paving the way for portable biochemical sensing.
    • The sensor demonstrates significant potential for high-sensitivity, multi-parameter measurements in various applications.