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Top panels: Scanning electron micrographs of sections of broadband meta-lenses. They are composed of silicon nanopillars with various cross-sectional shapes patterned on a glass substrate. Bottom panel: Photo showing two elements of a multi-element meta-lens imaging system. Credit: Sajan Shrestha, Adam Overvig, Nanfang Yu/Columbia Engineering

Revolutionary ultra-thin meta-lens enables full-color imaging

Light of various colors goes at various speeds in various materials and structures. This is the reason we see white light split into its...