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New “metalens” shifts focus without tilting or moving

THE DAILY REFORMER (NEW YORK, UNITED STATES)

Polished glass has been at the center of imaging systems for centuries. Their precise curvature enables lenses to focus light and produce sharp images, whether the object in view is a single cell, the page of a book, or a far-off galaxy. Changing focus to see clearly at all these scales typically requires physically moving a lens, by tilting, sliding, or otherwise shifting the lens, usually with the help of mechanical parts that add to the bulk of microscopes and telescopes. Now MIT engineers have fabricated a tunable “metalens” that can focus on objects at multiple depths, without changes to…

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