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Broadband meta-lenses (above) and elements of an ML imaging system (below).
Top panels: SEMs of sections of broadband meta-lenses. They are composed of silicon nanopillars with various cross-sectional shapes patterned on a glass substrate. Bottom panel: Two elements of a multi-element meta-lens imaging system. Image: Sajan Shrestha, Adam Overvig, Nanfang Yu/Columbia Engineering.
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