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Second-harmonic generation interferometry in magnetic-dipole nanostructures.

I A Kolmychek, A Yu Bykov, E A Mamonov

    Optics Letters
    |August 15, 2015
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    Summary
    This summary is machine-generated.

    We studied optical second-harmonic generation in gold "nanosandwiches." Near magnetic-dipole resonance, second-harmonic intensity significantly increased, indicating dominant nonlinear magnetic-dipole contributions.

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    Area of Science:

    • Nonlinear Optics
    • Plasmonics
    • Nanophotonics

    Background:

    • Optical second-harmonic generation (SHG) is a key nonlinear optical process.
    • Nanostructures offer unique optical properties due to plasmonic and magnetic resonances.
    • Understanding nonlinear responses in nanostructures is crucial for photonic device development.

    Purpose of the Study:

    • To experimentally investigate optical second-harmonic generation (SHG) from nanostructures.
    • To explore the role of magnetic dipole resonances in SHG.
    • To analyze the nonlinear magnetic-dipole polarization in Au/MgF(2)/Au nanosandwiches.

    Main Methods:

    • Fabrication of "nanosandwiches" (Au/MgF(2)/Au) with specific dimensions (140 nm disk diameter, 400 nm lattice period).
    • Experimental studies of SHG at normal incidence.
    • Analysis of SH wave intensity and phase shifts near magnetic-dipole resonance.

    Main Results:

    • Observed an order-of-magnitude increase in SHG intensity as excitation wavelength approached magnetic-dipole resonance.
    • Measured a significant phase shift (up to 330°) in the SH wave.
    • Experimental results align with a phenomenological description highlighting nonlinear magnetic-dipole polarization.

    Conclusions:

    • The study demonstrates the significant enhancement of SHG near magnetic-dipole resonance in plasmonic nanostructures.
    • Nonlinear magnetic-dipole polarization, driven by χ(emm) susceptibility, plays a dominant role in SHG for these "nanosandwiches."
    • These findings provide insights into controlling nonlinear optical responses in metamaterials.