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Flexibly designed spoof surface plasmon waveguide array for topological zero-mode realization.

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    We developed a flexible photonic system using ultrathin H-bar waveguides to support spoof surface plasmon polaritons (SPPs) at microwave frequencies. This system enables photonic simulations of quantum and topological phenomena, offering a versatile experimental platform.

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    Area of Science:

    • Photonics
    • Condensed Matter Physics
    • Metamaterials

    Background:

    • Spoof surface plasmon polaritons (SPPs) offer unique waveguiding properties at microwave frequencies.
    • Metallic waveguides with subwavelength corrugations enable SPP confinement and propagation.
    • Topological phenomena in condensed matter physics are increasingly being explored using photonic systems.

    Purpose of the Study:

    • To propose and demonstrate a flexibly designed photonic system based on ultrathin corrugated metallic "H-bar" waveguides.
    • To investigate the tunability of spoof SPP propagation by varying geometric parameters of the H-bar unit.
    • To construct a coupled waveguide array mimicking the Su-Schrieffer-Heeger (SSH) model for topological simulations.

    Main Methods:

    • Designing and fabricating ultrathin corrugated metallic "H-bar" waveguides.
    • Systematically varying geometric parameters (height, period, core width, rotation, shifting) to demonstrate design flexibility.
    • Analyzing the coupling effects by calculating propagation constants in hybrid waveguide designs.
    • Constructing a coupled waveguide array with dimerized spacing to emulate the SSH model.

    Main Results:

    • Demonstrated the flexibility of the H-bar waveguide design through five variations.
    • Observed the characteristic propagation of topological zero modes in the dimerized waveguide array.
    • Confirmed the ability to tune propagation constants and study coupling effects.

    Conclusions:

    • The proposed spoof SPP waveguide array offers high flexibility for experimental platforms.
    • It serves as a powerful tool for simulating quantum and topological phenomena described by the Schrödinger equation.
    • This system opens new avenues for exploring topological physics in photonic systems.