A single-layer of nano-structures on the surface of optical elements can correct chromatic aberrations across the visible spectrum, from simple lenses to “the super-complex objectives with as many as 14 conventional lenses, used in high-resolution microscopes”, according to Harvard University which has developed the technique. It has been dubbed ‘metacorrection’, and relies on pillars whose ...
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from Electronics Weekly https://www.electronicsweekly.com/news/research-news/meter-surface-corrects-chromatic-abberation-2018-11/
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