Large-Aperture Metalens Images Lunar Surface
UNIVERSITY PARK, Pa., March 8, 2023 — Researchers at Penn State have developed a metalens that is large enough to be put into a telescope, and used the optic to image the moon's surface. The metalens, which the researchers used to create a metalens telecscope instrument, works in the near-infrared range with nearly diffraction-limited focal spot sizes and a high peak focusing efficiency of 80.84% at 1450 nm experimentally. Despite the promise of metalenses, the researchers said, the aperture sizes of the devices, as engineered via...