Achromatic optical metasurface focusing element

• Main Authors: HU CHENJIE, GU TIANQI, GUO ZIMING, LUO ZUDE
• Format: Patent
• Language: Chinese; English
• Published: 18.09.2020
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

The invention provides an achromatic optical metasurface focusing element. The achromatic optical metasurface focusing element comprises a substrate and a plurality of cuboid nanorods generated on thesubstrate, wherein the nanorods are divided into a first size, a second size and a third size and correspond to a first wavelength lambda 1, a second wavelength lambda 2 and a third wavelength lambda3; the nanorods of the first size, the second size and the third size are alternately arranged in a regular hexagon array at intervals; the length and the width of the nanorods are coupled with the wavelength of an incident light beam, and rotation angles of the nanorods are coupled with the wavelength, the focal length, an additional phase modulation value and a position of the incident light beam, so that the focal lengths of the element to parallel incident light with three wavelengths are the same. According to the achromatic optical metasurface focusing element, the achromatic adaptationof incident beams with var