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Propagation of toroidal localized spoof surface plasmons using conductive coupling.

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    Researchers explored toroidal localized spoof surface plasmons (LSSPs) coupling in split-ring resonator disks. Introducing conductive coupling enhances LSSP propagation, enabling energy transfer applications.

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    Area of Science:

    • Electromagnetism
    • Plasmonics
    • Metamaterials

    Background:

    • Toroidal localized spoof surface plasmons (LSSPs) are crucial for novel electromagnetic phenomena.
    • Understanding LSSP coupling is essential for controlling wave propagation in metamaterials.
    • Existing coupling mechanisms can hinder LSSP propagation, limiting practical applications.

    Purpose of the Study:

    • To investigate the coupling dynamics of toroidal localized spoof surface plasmons (LSSPs) in split-ring resonator (SRR) disks.
    • To identify mechanisms that suppress and enable LSSP propagation.
    • To explore applications in electromagnetic energy transfer.

    Main Methods:

    • Numerical simulations of LSSP coupling in SRR disk platforms.
    • Experimental validation of simulated coupling effects in the microwave regime.
    • Introduction of conductive coupling to modify magnetic dipole coupling.

    Main Results:

    • Observed magnetic dipole coupling in toroidal LSSPs, leading to propagation suppression.
    • Demonstrated that conductive coupling corrects magnetic dipole coupling and enhances LSSP coupling.
    • Achieved effective propagation of toroidal LSSPs, even in bent SRR disk structures.

    Conclusions:

    • Conductive coupling is a viable method to overcome propagation limitations in toroidal LSSPs.
    • This research enhances the understanding of LSSP coupling mechanisms.
    • Findings support applications in efficient electromagnetic energy transfer using toroidal moments.