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A metasurface lens (meta-lens) bends light using nanostructures on a flatsurface. Macroscopic meta-lenses (mm- to cm-scale diameter) have been quitedifficult to simulate and optimize, due to the large area, the lack ofperiodicity, and the billions of adjustable parameters. We describe a methodfor designing a large-area meta-lens that allows not only prediction of theefficiency and far-field, but also optimization of the shape and position ofeach individual nanostructure, with a computational cost that is almostindependent of the lens size. As examples, we design three large NA=0.94meta-lenses: One with 79% predicted efficiency for yellow light, one withdichroic properties, and one broadband lens. All have a minimum feature size of100nm.

Designing large, high-efficiency, high-numerical-aperture, transmissive meta-lenses for visible light