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Researchers from Tokyo University of Agriculture and Technology (TUAT) have demonstrated that moiré metalenses can tune focal length along a wider range than previously seen. Moiré metalenses are tiny patterned lenses composed of artificial meta-atoms.
To keep these metalenses thin and compact enough for their desired uses, such as in MEMS devices, they have a limited focal tuning range. Focal length refers to the angle of view and the strength of the magnification, which is dictated by lens shape.
Schematic drawing of working principle. Courtesy of Kentaro Iwami/TUAT.
Convex lenses have positive focal length and bring light rays to a single point; concave lenses have negative focal lengths and disperse light…