Metalenses — flat surfaces that use nanostructures to focus light — promise to revolutionize optics by replacing the bulky, curved lenses currently used in optical devices with a simple, flat surface. But, these metalenses have remained limited in the spectrum of light they can focus well. Now a team of Harvard researchers has developed the first single lens that can focus the entire visible spectrum of light — including white light — in the same spot and in high resolution.

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