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    Area of Science:

    • Condensed Matter Physics
    • Photonics and Optics
    • Materials Science

    Background:

    • Surface magnetoplasmons (SMPs) are electromagnetic waves propagating at the interface of a magnetodielectric material and a plasmonic medium.
    • Yttrium-iron-garnet (YIG) is a well-known magneto-optical material with tunable properties via external magnetic fields.
    • Topological photonics offers robust wave propagation immune to defects and disorder.

    Purpose of the Study:

    • To theoretically investigate the properties of surface magnetoplasmons (SMPs) in a yttrium-iron-garnet (YIG) sandwiched waveguide.
    • To explore the potential of these SMPs for realizing magnetically controllable multimode interference (MMI).
    • To demonstrate the topological protection and tunability of these phenomena for optical applications.

    Main Methods:

    • Theoretical investigation of SMP dispersion relations in a YIG-based waveguide.
    • Analysis of mode behavior in both symmetric and asymmetric waveguide configurations.
    • Simulation of multimode interference (MMI) phenomena under magnetic control.
    • Assessment of topological protection against introduced disorder.

    Main Results:

    • The YIG waveguide supports topological unidirectional SMPs.
    • Magnetically controllable MMI based on unidirectional SMPs is verified in both symmetric and asymmetric waveguides.
    • A unidirectional even mode is supported in the asymmetric waveguide due to inter-YIG-air interface mode coupling.
    • Topological protection of these modes is confirmed even with introduced disorder.
    • Tunable splitters and mode conversion are achieved using robust unidirectional SMP MMI (USMMI).

    Conclusions:

    • The YIG waveguide offers a platform for topological unidirectional SMPs.
    • USMMI provides a robust and tunable method for manipulating light in optical circuits.
    • The demonstrated phenomena offer significant degrees of freedom for advanced topological wave manipulation.