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Related Experiment Video

Updated: Dec 27, 2025

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Phase interrogation SPR sensing based on white light polarized interference for wide dynamic detection range.

Youjun Zeng, Xueliang Wang, Jie Zhou

    Optics Express
    |March 4, 2020
    PubMed
    Summary

    A novel phase surface plasmon resonance (SPR) sensing technology utilizes white light interference for high sensitivity detection. This cost-efficient sensor achieves a sensitivity of 1.3 × 10-7 RIU without modulators.

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    Area of Science:

    • Photonics and optical sensing
    • Plasmonics
    • Interferometry

    Background:

    • Surface plasmon resonance (SPR) is a label-free biosensing technique.
    • Traditional SPR sensors often require complex optical setups and expensive components.
    • Developing cost-effective and sensitive SPR sensors remains a key challenge.

    Purpose of the Study:

    • To report a novel phase SPR sensing technology using white light polarized interference.
    • To demonstrate a simple, cost-efficient, and modulator-free SPR sensor implementation.
    • To achieve high sensitivity and a wide dynamic detection range.

    Main Methods:

    • Utilizing white light as the excitation source for SPR.
    • Employing a common-path geometry with a birefringence crystal to create interference fringes.
    • Implementing a novel iterative parameter-scanning cross-correlation algorithm for SPR phase extraction.
    • Using a window Fourier algorithm to track the optimal SPR wavelength for expanded dynamic range.

    Main Results:

    • Achieved a high sensitivity of 1.3 × 10-7 refractive index units (RIU).
    • Demonstrated a dynamic detection range of 0.029 RIU.
    • The system is simple to implement, cost-efficient, and requires no external modulators.

    Conclusions:

    • The developed phase SPR sensor offers a promising alternative for sensitive and cost-effective detection.
    • The novel algorithm enables accurate SPR phase extraction from interference fringes.
    • This technology has potential applications in various sensing fields requiring high-precision measurements.