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Generalized circuit model for coupled plasmonic systems.

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    We created a circuit model for plasmonic dimers that accurately predicts optical resonance wavelengths. This model explains how linker conductivity affects spectral shifts in coupled plasmons.

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    Area of Science:

    • Plasmonics
    • Nanophotonics
    • Condensed Matter Physics

    Background:

    • Coupled plasmonic systems exhibit unique optical properties dependent on interparticle gaps.
    • Understanding the influence of linker materials on plasmon resonance is crucial for device applications.

    Purpose of the Study:

    • To develop an analytic circuit model for coupled plasmonic dimers.
    • To accurately predict optical resonance wavelengths considering linker properties.
    • To elucidate the role of linker conductivity in spectral shifts.

    Main Methods:

    • Development of an equivalent circuit model for plasmonic dimers.
    • Analysis of partially conducting linker behavior within the circuit model.
    • Comparison of model predictions with experimental data and electromagnetic simulations.

    Main Results:

    • The circuit model provides a complete account of optical resonance wavelengths.
    • Quantitative agreement was achieved with both experimental measurements and full electromagnetic simulations.
    • The kinetic inductance of linkers was identified as the key factor determining spectral blue-shifts in the conducting regime.

    Conclusions:

    • The developed analytic circuit model offers a powerful tool for understanding coupled plasmonic dimers.
    • The model accurately describes the influence of linker conductivity on plasmon resonance.
    • Kinetic inductance is a critical parameter for tuning spectral properties in conducting plasmonic systems.