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    Area of Science:

    • Magnetoplasmonics
    • Nanophotonics
    • Optical effects in magnetic materials

    Background:

    • The transverse magneto-optical Kerr effect (TMOKE) in magnetic thin films is crucial for optical data storage and spintronics.
    • Previous studies attributed magnetoplasmonic enhancement of TMOKE to surface plasmon polariton (SPP) resonances.
    • The role of grating geometry in modulating these effects was not fully understood.

    Purpose of the Study:

    • To investigate the influence of noble metal grating geometry on the TMOKE of a magnetic dielectric film.
    • To explore the potential for enhancing, extinguishing, or switching the sign of TMOKE through resonance hybridization.
    • To demonstrate a novel approach for controlling magnetoplasmonic effects without altering magnetization.

    Main Methods:

    • Fabrication of a hybrid structure: a magnetic dielectric film coated with a 1D noble metal grating.
    • Characterization of the transverse magneto-optical Kerr effect.
    • Analysis of the interplay between surface plasmon resonances and cavity resonances within the grating structure.

    Main Results:

    • The TMOKE enhancement is highly sensitive to the precise geometry of the noble metal grating.
    • Hybridization of surface and cavity resonances leads to significant modulation of TMOKE: enhancement, extinction, and sign switching.
    • These effects are achieved without changing the magnetic film's magnetization.

    Conclusions:

    • Grating geometry offers unprecedented control over magnetoplasmonic effects in magnetic dielectric films.
    • The hybridization of surface and cavity resonances provides a powerful mechanism for tuning TMOKE.
    • This research opens new avenues for applications in advanced sensing and nanophotonics.