US 12,228,710 B1
Ultra-wide angle broadband polarization imaging system based on metasurface, and detection apparatus
Xiangang Luo, Sichuan (CN); Mingbo Pu, Sichuan (CN); Ting Xie, Sichuan (CN); Fei Zhang, Sichuan (CN); and Xiaoliang Ma, Sichuan (CN)
Assigned to THE INSTITUTE OF OPTICS AND ELECTRONICS, THE CHINESE ACADEMY OF SCIENCES, Sichuan (CN)
Appl. No. 18/719,222
Filed by THE INSTITUTE OF OPTICS AND ELECTRONICS, THE CHINESE ACADEMY OF SCIENCES, Sichuan (CN)
PCT Filed Nov. 16, 2022, PCT No. PCT/CN2022/132186
§ 371(c)(1), (2) Date Jun. 12, 2024,
PCT Pub. No. WO2023/109412, PCT Pub. Date Jun. 22, 2023.
Claims priority of application No. 202111518469.0 (CN), filed on Dec. 13, 2021.
Int. Cl. G02B 13/06 (2006.01); G01J 3/02 (2006.01); G01J 3/447 (2006.01); G02B 1/00 (2006.01); G02B 13/14 (2006.01)
CPC G02B 13/06 (2013.01) [G01J 3/0208 (2013.01); G01J 3/0224 (2013.01); G01J 3/447 (2013.01); G02B 1/002 (2013.01); G02B 13/14 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A metasurface-based ultra-wide-angle broadband polarization imaging system, wherein the system comprises, from an object side to an image side, a first lens having negative focal power, a linear polarizer, a quarter-wave plate, a diaphragm, a second lens having positive focal power, a third lens having positive focal power and a metasurface in sequence,
wherein object side surfaces and image side surfaces of the first lens, the second lens and the third lens are planar or spherical surfaces; and
the metasurface is composed of deep subwavelength structures, and a unit structure of the metasurface is a subwavelength silicon nanorod, wherein in the unit structure of the metasurface, an upper dielectric nanorod has a center-to-center spacing pM in a y direction and 0.1λ0<pM<0.6λ0, a spacing in an x direction being 100 nm, a width wM and 0.1λ0<wM<0.3λ0, and a height hM and 0.3λ0<hM<0.65λ0, where λ0 is center wavelength; and a rotation angle of a unit structure of the metasurface is θ, and by providing unit structures with different rotation angles θ, a phase distribution required by the imaging system under a broadband spectrum is realized.