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Related Experiment Video

Updated: Apr 10, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Twin-core fiber SPR sensor.

Zhihai Liu, Yong Wei, Yu Zhang

    Optics Letters
    |June 16, 2015
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new surface plasmon resonance (SPR) sensor using twin-core fiber (TCF) and a fundamental mode beam. This novel approach significantly enhances sensitivity for real-time refractive index monitoring in microfluidic applications.

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    Area of Science:

    • Photonics and Sensing Technologies
    • Optical Fiber Sensors
    • Nanotechnology

    Background:

    • Traditional fiber surface plasmon resonance (SPR) sensors often use multimode fiber (MMF) for improved coupling efficiency.
    • However, optimizing sensitivity in fiber SPR sensors requires a single-mode beam for reduced mode noise.

    Purpose of the Study:

    • To develop a novel SPR sensing approach utilizing a fundamental mode beam with a twin-core fiber (TCF).
    • To enhance the sensitivity and reduce mode noise in fiber SPR sensors.
    • To demonstrate real-time refractive index monitoring capabilities for microfluidic applications.

    Main Methods:

    • A twin-core fiber (TCF) tip was shaped into a frustum wedge.
    • A 50-nm gold sensing film was plated on the end face, with two 500-nm gold films on the side faces.
    • The configuration was used to implement an SPR sensing approach with a fundamental mode beam.

    Main Results:

    • The novel TCF-based SPR probe effectively reduced mode noise.
    • A high testing sensitivity of up to 6463 nm/RIU was achieved.
    • The probe demonstrated real-time monitoring of liquid refractive index changes (1.3333 to 1.3706) with an average sensitivity of 5213 nm/RIU.

    Conclusions:

    • The proposed fundamental mode beam SPR sensing approach based on TCF offers significantly higher sensitivity compared to multimode SPR systems.
    • This SPR probe is suitable for integration into microfluidic chips for precise, real-time refractive index measurements.