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Related Experiment Video

Updated: Jul 7, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
07:39

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

Published on: July 21, 2018

Optical phase-shift detection of surface plasmon resonance.

S Shen, T Liu, J Guo

    Applied Optics
    |February 15, 2008
    PubMed
    Summary

    A novel heterodyne optical system measures surface plasmon resonance (SPR) phase shifts. This method offers higher sensitivity and more information for SPR sensing applications compared to traditional reflection coefficient analysis.

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    Area of Science:

    • Optics and Photonics
    • Surface Science
    • Chemical Sensing

    Background:

    • Surface Plasmon Resonance (SPR) is a label-free optical technique widely used for detecting molecular interactions.
    • Traditional SPR sensing often relies on measuring changes in the reflection coefficient.
    • Real-time phase measurement in SPR systems can offer enhanced sensitivity and richer information.

    Purpose of the Study:

    • To present a heterodyne optical measurement system for studying SPR phase shifts.
    • To demonstrate the system's capability for real-time phase measurement in SPR sensing.
    • To compare the performance of phase shift measurement with reflection coefficient variation in SPR studies.

    Main Methods:

    • Development of a heterodyne optical measurement system.
    • Utilization of a frequency-stabilized Zeeman laser as the detection light source.
    • Measurement of phase shifts in an angular dispersion SPR excitation setup across a range of +180 to -120 degrees.

    Main Results:

    • The developed system successfully measured SPR phase shifts.
    • Experimental results demonstrated good agreement with theoretical analysis.
    • Phase shift measurements covered a significant range around the SPR excitation region.

    Conclusions:

    • The heterodyne optical system is suitable for real-time phase measurement in SPR sensing.
    • SPR phase shift measurement provides higher sensitivity than reflection coefficient variation.
    • Phase shift analysis offers more comprehensive information about the SPR resonance phenomenon.

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