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Compact flexible multifrequency splitter based on plasmonic graded metallic grating arc waveguide.

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    Researchers developed a compact, flexible multifrequency splitter using plasmonic metallic gratings. This device efficiently separates spoof surface plasmon polariton waves at various frequencies and angles.

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    Area of Science:

    • Plasmonics
    • Waveguide technology
    • Electromagnetics

    Background:

    • Spoof surface plasmon polariton (SSPP) waves offer unique electromagnetic confinement properties.
    • Conventional frequency splitters often lack compactness, flexibility, or multifrequency capabilities.
    • Metallic gratings provide a versatile platform for manipulating SSPP wave propagation.

    Purpose of the Study:

    • To propose and investigate a novel compact flexible multifrequency splitter.
    • To leverage graded-height T-grooves in arc waveguides for frequency separation.
    • To demonstrate flexible output control for different frequencies at distinct angles.

    Main Methods:

    • Numerical simulations were employed to analyze dispersion curves and cutoff frequencies.
    • The design utilizes plasmonic metallic grating structures with graded-height T-grooves.
    • Spoof surface plasmon polariton (SSPP) wave propagation was studied in arc waveguides.
    • An additional symmetrical T-groove structure was introduced for output flexibility.

    Main Results:

    • Different T-groove heights resulted in distinct dispersion characteristics and cutoff frequencies.
    • SSPP waves at various frequencies were localized at different angles along the arc waveguide.
    • Flexible multifrequency separation was achieved with compact four-, seven-, and eight-output splitters.
    • The device's dimensional size remained constant despite increased output ports.

    Conclusions:

    • The proposed arc waveguide splitter effectively separates multiple frequencies using graded-height plasmonic gratings.
    • The design offers flexible control over output angles for different frequencies.
    • Experimental results at microwave frequencies validated the numerical simulations, confirming device performance.