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Distributed fiber surface plasmon resonance sensor based on the incident angle adjusting method.

Zhihai Liu, Yong Wei, Yu Zhang

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    This study introduces a novel distributed surface plasmon resonance (SPR) fiber sensor. The innovative method enables precise, multichannel measurements of refractive index and temperature, overcoming limitations of traditional sensors.

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    Area of Science:

    • Photonics
    • Optical Sensing
    • Nanotechnology

    Background:

    • Traditional fiber surface plasmon resonance (SPR) sensors face challenges in achieving distributed sensing due to difficulties in creating distinct resonance wavebands.
    • The dynamic range of SPR sensors is highly dependent on the incident angle, limiting their application in complex sensing scenarios.

    Purpose of the Study:

    • To propose and demonstrate a novel, simple, and effective distributed SPR fiber sensor.
    • To overcome the limitations of conventional SPR sensors for distributed sensing applications.
    • To enable multichannel measurements of liquid refractive indices and simultaneous temperature self-reference.

    Main Methods:

    • A novel incident angle adjusting method was developed by grinding an eccentric-core fiber to specific angles (9° and 17°).
    • This method creates significantly different SPR wavebands, enabling distributed sensing capabilities.
    • The sensor was configured in a two-cascaded distributed setup.

    Main Results:

    • The proposed sensor achieved distinct resonance wavebands suitable for distributed sensing.
    • In the refractive index range of 1.333-1.385, testing wavelength ranges of 613-760 nm and 745-944 nm were observed.
    • Average testing sensitivities of 2826 nm/RIU and 4738 nm/RIU were recorded, with higher sensitivity correlating to larger resonance wavelengths.

    Conclusions:

    • The developed incident angle adjusting method effectively enables distributed sensing with SPR fiber sensors.
    • The sensor demonstrates significant potential for multichannel liquid refractive index sensing and temperature self-reference measurements.
    • This technology offers a promising solution for advanced optical sensing applications.