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    Metasurfaces enhance light-matter interactions. Breaking symmetry in waveguide-coupled metasurfaces significantly boosts nonlinear optical processes like difference-frequency generation by 70-fold.

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    Area of Science:

    • Photonics and Nanotechnology
    • Nonlinear Optics
    • Metasurface Engineering

    Background:

    • Metasurfaces enhance light-matter interactions via local fields or mode coupling.
    • Guided mode resonances are crucial for nonlinear metasurface performance.
    • Waveguide-coupled metasurfaces offer a platform for studying nonlinear optical phenomena.

    Purpose of the Study:

    • Investigate the impact of modal coupling on difference-frequency generation (DFG) in a waveguide-coupled metasurface.
    • Analyze how symmetry breaking influences nonlinear enhancement.
    • Explore methods to tailor nonlinear processes through metasurface design.

    Main Methods:

    • Fabrication of a metasurface platform using gold split-ring resonators on a TiO2 waveguide.
    • Experimental and theoretical analysis of light-matter interactions and modal coupling.
    • Characterization of difference-frequency generation efficiency under varying symmetry conditions.

    Main Results:

    • A symmetric configuration yielded modest enhancement in DFG.
    • Breaking the mirror symmetry introduced chirality and enabled coupling to higher quality modes.
    • This symmetry breaking resulted in a significant 70-fold enhancement of difference-frequency generation.

    Conclusions:

    • Metasurface mode manipulation is key to enhancing nonlinear optical processes.
    • Chirality introduced by symmetry breaking dramatically boosts DFG efficiency.
    • The findings provide new avenues for designing tailored nonlinear optical devices.