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Flat optics consisting of nanostructures of high-refractive-index materialsproduce lenses with thin form factors that tend to operate only at specificwavelengths. Recent attempts to achieve achromatic lenses uncover a trade-offbetween the numerical aperture (NA) and bandwidth, which limits performance.Here we propose a new approach to design high NA, broadband andpolarization-insensitive multilayer achromatic metalenses (MAM). We combinetopology optimization and full wave simulations to inversely design MAMs andfabricate the structures in low-refractive-index materials by two-photonpolymerization lithography. MAMs measuring 20 micrometer in diameter operatingin the visible range of 400-800 nm with 0.5 NA and 0.7 NA were achieved withefficiencies of up to 42%. We demonstrate broadband imaging performance of thefabricated MAM under white light, and RGB narrowband illuminations. Theseresults highlight the potential of the 3D printed multilayer structures forrealizing broadband and multi-functional meta-devices with inverse design.

3D Printed Multilayer Structures for High Numerical Aperture Achromatic Metalenses