In this Letter, we demonstrate polarization volume grating (PVG)-based couplers for a double-layer waveguide display to realize a full-color near-eye display. The polarized interference exposure with photo-alignment methods was employed to generate a birefringent spiral configuration with two-dimensional periodicity in a chiral-dopant reactive mesogen material. Such a structure presents a unique highly efficient single-order Bragg diffraction with polarized selectivity. The prepared PVG couplers exhibited over 80% diffraction efficiency with large diffraction angles at spectra of blue (457 nm),green(532 nm),and red(630 nm). The demonstrated waveguide prototype showed a full-color display with a diagonal field of view of around 35. The overall optical efficiency was measured as high as 118.3cd∕m2 per lumen with a transparency of 72% for ambient light.
https://www.osapublishing.org/ol/abstract.cfm?uri=ol-43-23-5773