Fig. 7
From: Design of waveguide with double layer diffractive optical elements for augmented reality displays
Structure of grating layer of double layer coupled waveguide combiner. (a) In-coupling grating structure with \(\text{d}\)=473.12 nm, \({\theta}_{\text{slant,in}}\)=28.2\(\:^\circ\:\), \(\:{\text{h}}_{\text{in}}\)=650 nm. (b) Out-coupling grating structure with \(\text{d}\)=473.12 nm, \({\theta}_{\text{slant,out}}\in\:\) [0\(\:^\circ\:\), 50\(\:^\circ\:\)], \(\:{\text{h}}_{\text{out}}=\) 670 nm. (c) Fold coupling grating structure with \(\:\text{d}\)=332.43 nm, \({\theta}_{\text{slant,fold}}=\)25\(\:^\circ\:\), \(\:{\text{h}}_{\text{fold}}\in\:\) [50 nm, 400 nm].
