US 11,733,521 B2
Heterogeneous layered volume Bragg grating waveguide architecture
Wanli Chi, Sammamish, WA (US); Yang Yang, Redmond, WA (US); Wai Sze Tiffany Lam, Bothell, WA (US); and Dominic Meiser, Bothell, WA (US)
Assigned to META PLATFORMS TECHNOLOGIES, LLC, Menlo Park, CA (US)
Filed by Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed on Feb. 17, 2021, as Appl. No. 17/178,016.
Prior Publication US 2022/0260836 A1, Aug. 18, 2022
Int. Cl. G02B 27/01 (2006.01); G02B 6/02 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 6/0208 (2013.01); G02B 2027/0123 (2013.01); G02B 2027/0174 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A waveguide display comprising a plurality of grating layers, the plurality of grating layers characterized by two or more different base refractive indices and including a set of volume Bragg gratings (VBGs) formed in the plurality of grating layers, wherein:
each VBG of the set of VBGs is configured to diffract display light in a different respective field-of-view (FOV) and wavelength range;
the set of VBGs includes a plurality of groups of VBGs; and
VBGs in each respective group of the plurality of groups of VBGs are characterized by a same grating period and include at least one VBG in each grating layer of the plurality of grating layers, wherein VBGs in a first group and a second group of the plurality of groups of VBGs are characterized by different grating periods.