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Resonant optical effects in composite Co/opal-based magnetoplasmonic structures.

I A Kolmychek, E A Mamonov, N S Gusev

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    Summary
    This summary is machine-generated.

    This study introduces novel cobalt/opal composite films for enhanced magnetoplasmonics. These structures achieve high light transmission and strong magneto-optical effects, overcoming limitations of traditional materials.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Condensed Matter Physics

    Background:

    • Plasmonic structures enable light flow manipulation.
    • Magnetoplasmonics utilizes magnetic fields to control plasmon excitations.
    • Traditional magnetoplasmonic structures often suffer from transmission loss when magneto-optical (MO) effects are enhanced.

    Purpose of the Study:

    • To investigate resonant optical effects in composite structures for improved magnetoplasmonic applications.
    • To explore the potential of cobalt/opal films for enhanced light transmission and MO effects.
    • To analyze the influence of nanostructure periodicity on extraordinary transmission and MO responses.

    Main Methods:

    • Fabrication of composite films with a thin cobalt layer on artificial opal substrates.
    • Formation of a 2D hexagonal lattice of nanoholes in the cobalt film.
    • Characterization of optical properties, including surface plasmon polariton (SPP) excitation and extraordinary transmission.
    • Investigation of magneto-optical effects, such as magnetization-induced second harmonic generation (SHG), in the Voigt geometry.

    Main Results:

    • The Co/opal periodic structure demonstrated surface plasmon polariton-assisted extraordinary transmission.
    • An increased magneto-optical effect was observed, correlated with magnetization intensity in the Voigt geometry.
    • Local field enhancement due to SPP excitation led to a significant boost in magnetization-induced second harmonic generation (SHG).
    • Fano-type resonances were identified for SHG and related MO effects, indicating strong light-matter interaction.

    Conclusions:

    • Co/opal composite films offer high light transmission combined with enhanced magneto-optical effects.
    • The observed phenomena make these films promising for advanced plasmonic and magnetoplasmonic applications.
    • The resonant optical effects, particularly Fano resonances in SHG, highlight the potential for novel device functionalities.