Fig. 5
From: Waveguide-based augmented reality displays: perspectives and challenges
Diffraction properties of reflective VHGs and PVGs. Spectral responses at incident angle \(\theta ={0}^{\circ}\) under different sample thickness of a PPVHGs, c HPDLC, and e PVGs. Angular responses at \(\lambda =532 \,\text{nm}\) under different sample thickness of b PPVHGs, d HPDLC, and f PVGs. The index modulation \(\left(\delta n\right)\) used in PPVHGs and HPDLC is 0.02 and 0.07, respectively. The birefringence \(({\Delta }n)\) of PVGs is 0.2