Quasi-periodic optical metasurface imaging element

• Main Authors: HU CHENJIE, GU TIANQI, GUO ZIMING, LUO ZUDE
• Format: Patent
• Language: Chinese; English
• Published: 29.09.2020
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

The invention provides a quasi-periodic optical metasurface imaging element. The quasi-periodic optical metasurface imaging element comprises a substrate and a plurality of cuboid nanorods generated on the substrate, the nanorods are divided into a first size and a second size which respectively correspond to a first wavelength lambda 1 and a second wavelength lambda 2; the first size of nanorodsand the second size of nanorods are alternately arranged in a gold spiral shape at intervals; the length and the width of the nanorod are coupled with the wavelength of an incident light beam; and therotation angle of the nanorod is coupled with the wavelength, focal length, additional phase modulation value and position of the incident light beam, so that the focal length of the element to the parallel incident light with two wavelengths is the same. By adjusting the length, the width and the rotation angle of the nanorod, adaptation to incident beams with various wavelengths can be achieved, the incident beams are f