Metalens is an artificial eye. Free Technical Library News

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Metalens - artificial eye

02.03.2018

Scientists from the School of Engineering and Applied Sciences at Harvard University have developed a metalens that is similar to the human eye: its focal length can be changed with the help of artificial muscles.

The human eye, with the help of the ciliary muscle, can change the curvature of the lens - a lens that focuses the reflection of light rays from an object. Due to this, the eye can equally well see and distinguish objects located at different distances.

American physicists have created an analogue of such a device using metalens - an array of nanoparticles, the distance between which is less than a wavelength. The scientists decided to change the optical parameters of the system by changing the distances between the nanoparticles.

The lens thickness was 30 micrometers. An electromechanical device made of a dielectric polymer and electrodes was used as an artificial muscle that controls the optical properties of the artificial eye. When different voltages were applied to the electrodes, the metalens could be compressed or stretched; thus its focal length decreased or increased.

"This shows the wide scope of the use of built-in optical zoom - in mobile phone cameras, glasses and virtual and augmented reality devices," one of the authors of the study said.

In addition to being used for the development of technology, an artificial lens can be used in ophthalmology in the future. According to scientists, with the help of an artificial eye it is possible to correct defects in the spectrum of vision, in particular, astigmatism.

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