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Updated: May 3, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Two-level optimizer for large-scale metasurfaces with strong near-field coupling.

Yiwen Fan, Jannick P Rolland, A Nick Vamivakas

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    Summary

    We developed a new metasurface design method to improve focusing intensity by 73.2%. This inverse-design approach optimizes hundreds of parameters, overcoming fabrication challenges for low aspect-ratio metasurfaces.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Computational Physics

    Background:

    • Metasurfaces offer novel optical functionalities but designing them with high performance, especially for low aspect-ratio structures, faces fabrication-performance trade-offs.
    • Accurate modeling of near-field coupling effects is crucial for optimizing metasurface performance but computationally intensive.
    • Inverse-design approaches are powerful for optimizing complex structures like metasurfaces.

    Purpose of the Study:

    • To introduce a novel two-level window-based optimization architecture for the inverse-design of metasurfaces.
    • To accurately model near-field coupling effects during the optimization process.
    • To address the established fabrication-performance tradeoff for low aspect-ratio metasurfaces.

    Main Methods:

    • A two-level window-based optimization architecture with two nested iterative optimizers was developed.
    • The method enables the inverse-design of metasurfaces with hundreds of adjustable parameters.
    • Near-field coupling effects were accurately modeled throughout the optimization process.

    Main Results:

    • The architecture effectively optimized a 300 unit-cell metalens with a 108 µm aperture diameter.
    • A 73.2% increase in focusing intensity was achieved compared to conventional designs.
    • The method successfully addressed the fabrication-performance tradeoff for low aspect-ratio metasurfaces.

    Conclusions:

    • The proposed two-level window-based optimization architecture is effective for inverse-design of complex metasurfaces.
    • This approach significantly enhances focusing intensity while managing near-field coupling.
    • The method provides a pathway to overcome limitations in metasurface fabrication and performance for specific applications.