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In this letter, we experimentally report an achromatic metalens (AML)operating over a continuous bandwidth in the visible. This is accomplished viadispersion engineering of dielectric phase shifters: titanium dioxidenanopillars tiled on a dielectric spacer layer above a metallic mirror. The AMLworks in reflection mode with a focal length independent of wavelength fromwavelength of 490 nm to 550 nm. We also design a metalens with reversechromatic dispersion, where the focal length increases as the wavelengthincreases, contrary to conventional diffractive lenses. The ability to engineerthe chromatic dispersion of metalenses at will enables a wide variety ofapplications that were not previously possible. In particular, for the AMLdesign, we envision applications such as imaging under LED illumination,fluorescence, and photoluminescence spectroscopy.

Achromatic Metalens in the Visible and Metalens with Reverse Chromatic Dispersion