Researchers Develop Flat Lens a Thousand Times Thinner Than a Human Hair
upstart writes in with an IRC submission for RandomFactor:
Researchers develop flat lens a thousand times thinner than a human hair:
A lens that is a thousand times thinner than a human hair has been developed in Brazil by researchers at the University of Sao Paulo's Sao Carlos School of Engineering (EESC-USP). It can serve as a camera lens in smartphones or be used in other devices that depend on sensors.
[...] The lens consists of a single nanometric layer of silicon on arrays of nanoposts that interact with light. The structure is printed by photolithography, a well-known technique used to fabricate transistors.
This kind of lens is known as a metalens.
[...] "Our lens has an arbitrary field of view, which ideally can reach 180 without image distortion," Rezende Martins said. "We've tested its effectiveness for an angle of 110. With wider angles of view, light energy decreases owing to the shadow effect, but this can be corrected by post-processing."
Previously metalenses have been limited in their field of view. This lens opens up a much wider range of possibilities.
Journal Reference:
Augusto Martins, et. al.,On Metalenses with Arbitrarily Wide Field of View, ACS Photonics (DOI: 10.1021/acsphotonics.0c00479)
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