US 12,298,508 B2
Imaging waveguide
Arseny Alexeev, Abingdon (GB); Cheng Shi, Oxford (GB); Christian William Olavi Sol, London (GB); Parashara Panduranga, Banbury (GB); and Venkata Karthik Nagareddy, Swindon (GB)
Assigned to Snap Inc., Santa Monica, CA (US)
Filed by Snap Inc., Santa Monica, CA (US)
Filed on Apr. 11, 2022, as Appl. No. 17/718,059.
Claims priority of provisional application 63/174,385, filed on Apr. 13, 2021.
Claims priority of provisional application 63/174,000, filed on Apr. 12, 2021.
Prior Publication US 2022/0334396 A1, Oct. 20, 2022
Int. Cl. G02B 27/01 (2006.01); G02B 6/28 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 6/2817 (2013.01); G02B 2027/0138 (2013.01); G02B 2027/0178 (2013.01)] 30 Claims
OG exemplary drawing
 
1. An optical waveguide combiner, comprising;
an optical waveguide substrate;
an optical input region, wherein said optical input region comprises an optical input diffractive grating integrated in, or disposed on, said optical waveguide substrate;
an optical output region, wherein said optical output region comprises an optical output diffractive grating integrated in, or disposed on, said optical waveguide substrate; and
at least one non-diffractive region, wherein said at least one non-diffractive region comprises at least one optical non-diffractive array of nanostructures, wherein said at least one optical non-diffractive array of nanostructures is integrated in, or disposed on, an object side of said optical waveguide substrate and at least partially surrounds at least said optical output diffractive grating, wherein an external visible reflectance of said at least one optical non-diffractive array of nanostructures is substantially equal to an external visible reflectance of said optical output diffractive grating.