Open AccessChirped polarization volume grating with ultra-wide angular bandwidth and high efficiency for see-through near-eye displays
Author(s) -
Kun Yin,
Hung-Yuan Lin,
Shin–Tson Wu
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.035895
Subject(s) - optics , grating , diffraction efficiency , holography , bandwidth (computing) , polarization (electrochemistry) , diffraction grating , holographic grating , diffraction , volume hologram , materials science , holographic display , physics , computer science , telecommunications , chemistry
We report a reflective chirped polarization volume grating (CPVG) with a dramatically wider angular bandwidth and significantly higher first-order diffraction efficiency than the holographic volume grating and surface relief grating for large field-of-view (FOV) augmented reality (AR) displays. By introducing gradient pitch structure along the beam propagation direction, the angular bandwidth is extended from 18° to 54° while keeping over 80% diffraction efficiency. We also prepare a two-layer reflective PVG and compare its performance with the chirped structure. Based on the simulation and experimental results, CPVG is a strong contender for large FOV AR displays.