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Manchester Samba (Reino Unido)

Flat Lens a Thousand Times Thinner Than a Human Hair Offers a Wide Field of View for Smartphone Cameras

Publicado em 26 agosto 2020

The lens can be used to produce high-resolution images with a wide field of view. It can serve as a camera lens in smartphones and can be used in other devices that depend on sensors (high resolution wide angle selfie obtained using metalens.

A lens that is a thousand times thinner than a human hair has been developed in Brazil by researchers at the University of São Paulo’s São 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.

“In the present technological context, its applications are almost unlimited,” Emiliano Rezende Martins, a professor in EESC-USP’s Department of Electrical Engineering and Computing and last author of a published paper on the invention, told Agência FAPESP.

The paper is entitled “On Metalenses with Arbitrarily Wide Field of View” and is published in ACS Photonics. The study was supported by FAPESP via a scholarship for a research internship abroad awarded to Augusto Martins, PhD candidate and lead author of the paper.

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. Metalenses were first developed ten years ago and achieve the highest resolution that is physically feasible, using an ultrathin array of tiny waveguides called a metasurface that bends light as it passes through the lens.

According to Rezende Martins, metalenses have long faced the problem that the angle of view is extremely small (less than 1°). “One way to solve the problem is to combine metalenses, forming complex structures,” he said.[…]

Continue reading: Flat Lens a Thousand Times Thinner Than a Human Hair Offers a Wide Field of View for Smartphone Cameras

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