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Researchers develop flat lens a thousand times thinner than a human hair

Publicado em 24 agosto 2020

Por José Tadeu Arantes

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. Credit: Augusto Martins/USP

"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, Ph.D. 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…

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