Thinnest lens on Earth (IMAGE)
Caption
The thinnest lens on Earth, made of concentric rings of tungsten disulphide (WS2), uses excitons to efficiently focus light. The lens is as thick as a single layer of WS2, just three atoms thick. The bottom left shows an exciton: an excited electron bound to the positively charged ‘hole’ in the atomic lattice. Image by Ludovica Guarneri and Thomas Bauer.
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Image by Ludovica Guarneri and Thomas Bauer.
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