Notícia

US Times Now (EUA)

Specialists are developing flat lenses that are thousands of times thinner than human hair

Publicado em 25 agosto 2020

Por Jason Laing

A lens that is a thousand times more thinner than a human hair has been created in Brazil by analysts at the University of São Paulo’s São Carlos School of Engineering (EESC-USP).

It can fill in as a camera focal point in cell phones or be utilized in different gadgets that rely upon sensors.

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

The paper is entitled “On Metalenses with Arbitrarily Wide Field of View” and is distributed in ACS Photonics. The investigation was bolstered by FAPESP through a grant for an examination temporary position abroad granted to Augusto Martins, Ph.D. up-and-comer and lead creator of the paper.

The lens comprises of a single nanometric layer of silicon on varieties of nanoposts that connect with light. The structure is printed by photolithography, a notable method used to fabricate transistors.

This sort of lens is known as a metalens. Metalenses were first evolved ten years back and accomplish the most noteworthy goal that is physically feasible, utilizing a ultrathin cluster of small waveguides called a metasurface that curves light as it goes through the perspective.

As per Rezende Martins, metalenses have since quite a while ago confronted the issue that the edge of view is very little (under 1°). “One way to solve the problem is to combine metalenses, forming complex structures,” he said.

In light of the acknowledgment that in an ordinary focal point an expansion in refraction record builds the field of view in relation to the levelness of the lens, the creators structured a metalens to mirror an absolutely flat lens with an endless refraction file, which couldn’t be acquired with a customary lens.

“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.”

Consolidating metalenses forestalls super-resolution, however the goal acquired is adequate for every regular application. Martins tried the metalens with a 3-D printed camera and acquired high-goal pictures with a wide field of view. “So far we’ve only succeeded in photographing in green, but in the months ahead we’ll upgrade the lens so that all colors are feasible,” he said.

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