期刊
OPTICS EXPRESS
卷 31, 期 21, 页码 35282-35292出版社
Optica Publishing Group
DOI: 10.1364/OE.503493
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In this study, a liquid crystal reflective gradient polarization volume grating is proposed and demonstrated for achieving large angular bandwidth in waveguide near-eye display, providing a wide field-of-view for augmented reality.
Angular bandwidth, which is critical to field-of-view, plays important role in diffractive optical waveguide augmented reality display. However, design and fabrication of large angular bandwidth is still a challenge. Herein, we demonstrate a liquid crystal reflective gradient polarization volume grating with three-dimensional gradient periodic structure for waveguide near-eye display. Two-beam polarization interference with special designed periodic gradient photomask are applied to chiral-dopant reactive mesogens doped with ultraviolet dye for generating gradient three-dimensional configuration of liquid crystals, resulting in gradient polarization volume grating with extended angle bandwidth of 61 degrees while keeping 80% diffraction efficiency, with peak efficiency near 100%. The proposed gradient polarization volume grating provides an effective method to broaden the angular bandwidth in waveguide for wide field-of view augmented reality display. (c) 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
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