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Long-range surface plasmons supported by a bilayer metallic structure for sensing applications.

M Zekriti, Dmitry V Nesterenko, Z Sekkat

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    A novel bimetallic asymmetric structure efficiently supports long-range surface plasmons (LRSPs). This configuration offers significantly enhanced resolution and figures of merit compared to traditional sensors.

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    Area of Science:

    • Plasmonics
    • Nanophotonics
    • Optical Sensing

    Background:

    • Surface plasmon resonance (SPR) sensors are crucial for detecting analytes.
    • Conventional SPR sensors often face limitations in sensitivity and resolution.
    • Long-range surface plasmons (LRSPs) offer potential for improved sensing performance.

    Purpose of the Study:

    • To theoretically and experimentally investigate LRSPs in a novel asymmetric bimetallic structure.
    • To optimize the geometrical parameters of the structure for efficient LRSP excitation.
    • To compare the performance of the bimetallic asymmetric structure with monometallic and conventional SPR sensors.

    Main Methods:

    • Utilized the transfer matrix method based on Fresnel reflection for theoretical optimization.
    • Employed a custom-made automated optical setup for experimental excitation of LRSPs.
    • Performed angular interrogation with a precision of 0.01° to analyze reflectivity.

    Main Results:

    • Demonstrated that the asymmetric bimetallic structure (silver/gold bilayer with MgF2 buffer) supports LRSPs.
    • Optimized geometrical parameters for efficient LRSP excitation.
    • The bimetallic asymmetric structure achieved superior minimum reflectivity resolution compared to monometallic structures.

    Conclusions:

    • The bimetallic asymmetric structure significantly enhances LRSP excitation and sensing capabilities.
    • Achieved a figure of merit more than double that of monometallic LRSP configurations.
    • The proposed sensor design offers an 8-fold improvement in figure of merit over conventional SPR sensors.