Nanowerk August 24, 2020
In a conventional lens an increase in refraction index increases the field of view in proportion to the flatness of the lens. To image with a single element over a wide field of view an international team of researchers (Brazil, UK, China) used photolithography to design a lens consisting of a single nanometric layer of silicon on arrays of nanoposts that interact with light. The resulting metalens mimics a totally flat lens with an infinite refraction index, which could not be obtained with a conventional lens. It has a field of view, which ideally can reach 180° without image distortion. Its effectiveness was tested for an angle of 110°. With wider angles of view, light energy decreases owing to the shadow effect, but is sufficient for all conventional applications. So far they have succeeded in photographing in green. They plan to upgrade the lens so that all colors are feasible…read more. TECHNICAL ARTICLE
Abstract. Credit: ACS Photonics 2020, 7, 8, 2073–2079, June 30, 2020.Â