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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Dichroic directional excitation of surface plasmon based on an integer-programming model.

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    This study introduces a novel method for dichroic directional excitation of surface plasmon polaritons (SPPs) using a perforated silver film. The approach enables simultaneous control over SPP propagation direction and wavelength for advanced optical applications.

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    Area of Science:

    • Plasmonics
    • Nanophotonics
    • Optical Engineering

    Background:

    • Surface Plasmon Polaritons (SPPs) are crucial for nanoscale light manipulation.
    • Controlling SPP excitation direction and wavelength simultaneously presents a significant challenge.

    Purpose of the Study:

    • To propose and theoretically validate a method for dichroic directional excitation of SPPs.
    • To enable simultaneous excitation of SPPs at two wavelengths propagating in controlled directions.

    Main Methods:

    • Utilizing a silver film with two subwavelength slits for SPP excitation.
    • Employing backside oblique illumination at specific wavelengths.
    • Developing an integer-programming model with branch and bound method for parameter optimization.
    • Verifying the design using the finite-difference time-domain (FDTD) method.

    Main Results:

    • Demonstrated the feasibility of dichroic directional excitation of SPPs.
    • Achieved control over SPP propagation direction (same or opposite) based on illumination.
    • Optimized structural parameters and illumination angles for desired SPP excitation.

    Conclusions:

    • The proposed theoretical model successfully achieves simultaneous dichroic directional excitation of SPPs.
    • This method offers a pathway for advanced control in plasmonic devices and nanophotonic systems.