US 12,259,586 B2
Optical device
James Leighton, Burghfield Common (GB)
Assigned to SNAP INC., Santa Monica, CA (US)
Appl. No. 17/995,552
Filed by Snap Inc., Santa Monica, CA (US)
PCT Filed Apr. 7, 2021, PCT No. PCT/EP2021/059090
§ 371(c)(1), (2) Date Oct. 5, 2022,
PCT Pub. No. WO2021/204891, PCT Pub. Date Oct. 14, 2021.
Claims priority of application No. 20168514 (EP), filed on Apr. 7, 2020.
Prior Publication US 2023/0152536 A1, May 18, 2023
Int. Cl. G02B 6/42 (2006.01); G02B 27/01 (2006.01)
CPC G02B 6/4206 (2013.01) [G02B 6/4214 (2013.01); G02B 27/0172 (2013.01); G02B 27/017 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical device comprising:
a first waveguide comprising a first surface; and
a second waveguide comprising a second surface,
wherein the first waveguide is at a fixed position relative to the second waveguide with the first surface at least partly facing the second surface, and
the first surface comprises a first positioning element, wherein the first positioning element is a NanoImprint Lithography (NIL) structure,
the second surface comprises a second positioning element, wherein the second positioning element is a NanoImprint Lithography (NIL) structure,
the optical device further comprising an adhesive arranged for attaching the first surface to the second surface,
wherein the first positioning element is arranged to control a position of the adhesive, and the first positioning element comprises at least one of:
a philic region adapted to attract the adhesive by having a lower contact angle with the adhesive compared to surrounding regions; or
a phobic region adapted to repel the adhesive by having a higher contact angle with the adhesive compared to surrounding regions.