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Updated: Sep 11, 2025

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Tunable unidirectional large-area surface magnetoplasmons in a stratified waveguide.

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    We developed a robust and broadband unidirectional large-area surface magnetoplasmon (LSMP) mode for wave manipulation. This mode enables tunable one-way propagation and applications in all-optical communication and imaging.

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    Area of Science:

    • Photonics and Wave Manipulation
    • Plasmonics
    • Metamaterials

    Background:

    • Large-area unidirectional modes are crucial for wave manipulation but often suffer from limited tunability and narrow bandwidth.
    • Existing implementations face challenges where small structural changes drastically alter one-way propagation.
    • Developing robust and broadband unidirectional modes remains a significant research objective.

    Purpose of the Study:

    • To propose and investigate a robust and broadband unidirectional large-area surface magnetoplasmon (LSMP) mode.
    • To demonstrate tunable one-way propagation with uniform electric field amplitude and flat phase profile.
    • To explore applications of LSMP modes in beam focusing, Bessel beam generation, and beam splitting.

    Main Methods:

    • Theoretical analysis of LSMP modes in a stratified waveguide.
    • Numerical simulations to validate the proposed mode.
    • Investigation of a waveguide structure comprising magnetized yttrium iron-garnet, air, and mu-negative materials.
    • Parameter tuning, specifically the filling ratio of mu-negative materials, to control LSMP mode characteristics.

    Main Results:

    • Demonstration of a robust and broadband unidirectional LSMP mode.
    • Achieved tunable one-way propagation with uniform electric field amplitude and a nearly flat phase profile.
    • Successfully demonstrated beam focusing, Bessel beam generation, and an adjustable beam splitter utilizing LSMP modes.

    Conclusions:

    • The proposed LSMP mode offers enhanced control over wave propagation with improved robustness and bandwidth.
    • The unique electric field distribution facilitates diverse optical functionalities, including beam manipulation.
    • These findings hold significant potential for advancements in all-optical communication, imaging, and holographic applications.