http://ift.tt/eA8V8J 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 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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