US 12,461,276 B2
Reflective optical metasurface films
Martin B. Wolk, Woodbury, MN (US); Robert L Brott, Woodbury, MN (US); Karl K. Stensvad, Eagan, MN (US); Vadim N. Savvateev, St. Paul, MN (US); James M. Nelson, Lino Lakes, MN (US); Lin Zhao, Woodbury, MN (US); Caitlin Race, Stillwater, MN (US); and Adam D. Haag, Woodbury, MN (US)
Assigned to 3M Innovative Properties Company, St. Paul, MN (US)
Appl. No. 17/919,368
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Apr. 9, 2021, PCT No. PCT/IB2021/052955
§ 371(c)(1), (2) Date Oct. 17, 2022,
PCT Pub. No. WO2021/220089, PCT Pub. Date Nov. 4, 2021.
Claims priority of provisional application 63/018,547, filed on May 1, 2020.
Prior Publication US 2023/0184996 A1, Jun. 15, 2023
Int. Cl. G02B 1/00 (2006.01); C23C 14/10 (2006.01); C23C 14/20 (2006.01); C23C 14/34 (2006.01); G02B 5/30 (2006.01)
CPC G02B 1/002 (2013.01) [C23C 14/10 (2013.01); C23C 14/205 (2013.01); C23C 14/3464 (2013.01); G02B 5/305 (2013.01); G02B 5/3066 (2013.01); G02B 2207/101 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An optical metasurface film, comprising:
a flexible polymeric film having a first major surface;
a patterned polymer layer having a first surface proximate to the first major surface of the flexible polymeric film and having a second nanostructured surface opposite the first surface;
a refractive index contrast layer comprising a refractive index contrast material adjacent to the nanostructured surface of the patterned polymer layer forming a nanostructured bilayer with a nanostructured interface, the nanostructured bilayer comprising a plurality of nanostructures disposed on the flexible polymeric film, wherein the nanostructured bilayer acts locally on an amplitude, phase, or polarization of light, or a combination thereof and imparts a light phase shift that varies as a function of position of the nanostructured bilayer on the flexible polymeric film, and the light phase shift of the nanostructured bilayer defines a predetermined operative phase profile of the optical metasurface film; and
a light reflecting layer in optical communication with the nanostructured bilayer,
wherein the light reflecting layer separates the flexible polymeric film from the nanostructured bilayer.