Flat lens promises a revolution in optics, and they are unlike the curved disks of glass found everywhere from cameras to binoculars. Instead, it is made of a thin layer of transparent quartz coated in millions of tiny pillars, each just tens of nanometres across and hundreds high. Singly, each pillar interacts strongly with light. Their combined effect is to slice up a light beam and remould it as the rays pass through the array... The team is already working on beating the performance of its first prototypes.
Read more over at this source... on BBC.
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