US 12,242,023 B2
Broadband achromatic polarization-insensitive metalens with anisotropic nanostructures
Wei-Ting Chen, Cambridge, MA (US); Alexander Yutong Zhu, Cambridge, MA (US); and Federico Capasso, Cambridge, MA (US)
Assigned to PRESIDENT AND FELLOWS OF HARVARD COLLEGE, Cambridge, MA (US)
Appl. No. 17/279,060
Filed by PRESIDENT AND FELLOWS OF HARVARD COLLEGE, Cambridge, MA (US)
PCT Filed Sep. 24, 2019, PCT No. PCT/US2019/052720
§ 371(c)(1), (2) Date Mar. 23, 2021,
PCT Pub. No. WO2020/068844, PCT Pub. Date Apr. 2, 2020.
Claims priority of provisional application 62/736,420, filed on Sep. 25, 2018.
Prior Publication US 2022/0048764 A1, Feb. 17, 2022
Int. Cl. G02B 1/00 (2006.01); B82Y 20/00 (2011.01); B82Y 40/00 (2011.01); G02B 5/18 (2006.01)
CPC G02B 1/002 (2013.01) [B82Y 20/00 (2013.01); B82Y 40/00 (2013.01); G02B 5/1814 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical device, comprising:
a metasurface including a plurality of anisotropic nanoscale elements defining an optical profile that focuses a broadband incident light beam to a diffraction limited spot;
wherein the optical profile is insensitive to a polarization state of the broadband incident light beam and tailorable according to wavelengths of the incident light; and
wherein the broadband incident light beam includes a plurality of wavepackets, and the optical profile includes a phase term that specifies parameters of the anisotropic nanoscale elements such that the wavepackets are transmitted towards the diffraction limited spot.