US 12,320,978 B2
Multilayer waveplate optical structures
Wai Sze Tiffany Lam, Redmond, WA (US); and Yijing Fu, Redmond, WA (US)
Assigned to Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed by Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed on Jul. 16, 2021, as Appl. No. 17/378,223.
Application 17/378,223 is a continuation of application No. 15/926,918, filed on Mar. 20, 2018, granted, now 11,092,808.
Prior Publication US 2021/0341743 A1, Nov. 4, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 27/01 (2006.01); F21V 8/00 (2006.01); G02B 5/30 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 5/3083 (2013.01); G02B 6/0016 (2013.01); G02B 6/0028 (2013.01); G02B 6/0036 (2013.01); G02B 6/0076 (2013.01); G02B 2027/0178 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An optical structure comprising:
an input grating configured to incouple a first spectrum of received image light, wherein the input grating is configured to transmit a first polarization orientation of the image light and reflect a second polarization orientation of the image light; and
a multilayer waveplate configured to reflect the first spectrum of the image light incoupled by the input grating in the second polarization orientation and reflect a second spectrum of the image light incoupled by the input grating by diffraction in the first polarization orientation, wherein the multilayer waveplate is configured to act as a half-wave plate in reflection for the first spectrum of the image light diffracted by the input grating and configured to act as a full-wave plate in reflection for the second spectrum of the image light diffracted by the input grating.