公开(公告)号：US20210033770A1

公开(公告)日：2021-02-04

申请号：US17073249

申请日：2020-10-16

申请人： Facebook Technologies, LLC

发明人： Lu LU ,  Xiayu FENG ,  Mengfei WANG ,  Hao YU ,  Ryan LI ,  Yun-Han LEE ,  Junren WANG ,  Barry David SILVERSTEIN

IPC分类号： G02B5/32 ,  G02B5/30 ,  G02B5/20 ,  G03H1/02 ,  G03H1/04

摘要： A first layer of anisotropic material extends along a first plane and includes anisotropic components being parallel to a second plane non-parallel and non-perpendicular to the first plane. The anisotropic components are arranged in cycloidal or helical patterns. The cycloidal or helical patterns define one or more Bragg planes that are non-parallel and non-perpendicular to the first plane and either substantially parallel or substantially perpendicular to the second plane.