US 11,885,969 B2
Flat spectral response gratings using high index materials
Pierre St. Hilaire, Belmont, CA (US); Mohammadreza Khorasaninejad, Milpitas, CA (US); and Dianmin Lin, Los Altos, CA (US)
Assigned to Magic Leap, Inc., Plantation, FL (US)
Filed by Magic Leap, Inc., Plantation, FL (US)
Filed on Mar. 10, 2022, as Appl. No. 17/691,868.
Application 17/691,868 is a continuation of application No. 16/919,718, filed on Jul. 2, 2020, granted, now 11,300,791.
Claims priority of provisional application 62/889,650, filed on Aug. 21, 2019.
Prior Publication US 2022/0197040 A1, Jun. 23, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 27/01 (2006.01); F21V 8/00 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 6/0038 (2013.01); G02B 6/0061 (2013.01); G02B 6/0076 (2013.01); G02B 2027/0112 (2013.01); G02B 2027/0118 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system comprising:
a plurality of optical elements in optical communication, the plurality of optical elements being stacked in a first direction, and the plurality of optical elements being configured, during operation, to project an image in a field of view of a user,
wherein a first optical element of the plurality of optical elements is configured to receive light from a second optical element of the plurality of optical elements;
wherein the first optical element defines a binary grating at along a periphery of the first optical element, the binary grating comprising:
a plurality of protrusions extending from a base portion of the first optical element and towards the second optical element in the first direction, the protrusions comprising a first material having a first refractive index for a visible wavelength of light, and each of the protrusions comprising a first surface opposite the base portion of the first optical element; and
a second material disposed between at least some of the plurality of protrusions along the base portion of the first optical element, the second material having a second refractive index for the visible wavelength of light,
wherein there is an absence of the second material on the first surfaces of the protrusions.