Fig. 3
From: Waveguide-based augmented reality displays: perspectives and challenges
(e Is redrawn from [1]. f, g Are adapted with permission from [41] © The Optical Society. h Is adapted with permission from [42] © 2023 DigiLens Inc.)
Structure and fabrication of various SRGs. a Straight binary SRGs. b Slanted binary SRGs. c Triangular (blazed) SRGs. d Multilevel SRGs. The thickness of the arrows indicated the diffracted intensities. e Trapezoidal SRGs. f Replication master and g replicated SRG utilizing nanoimprint lithography. h High aspect ratio SRG based on optical interference lithography