Open AccessOptimization of gratings in a diffractive waveguide using relative-direction-cosine diagrams
Author(s) -
Deqing Kong,
Zichen Zhao,
Xiaogang Shi,
Xiaojun Li,
Bingjie Wang,
Zhenghui Xue,
ShuangLong Li
Publication year - 2021
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.433515
Subject(s) - optics , monochromatic color , grating , diffraction , waveguide , diffraction efficiency , diffraction grating , trigonometric functions , materials science , physics , mathematics , geometry
Designing diffractive waveguides for head-mounted displays requires wide-angle conical diffraction analysis of multiple gratings. In this work, diffractive waveguide design using the relative direction cosine space, which extends the direction cosine space to a relative space involving refractive indices and can describe grating diffraction through various media, is demonstrated. A diffractive waveguide was fabricated with grating periods of 382 and 270 nm, which generated a monochromatic virtual image image in green light (520 nm). The maximum field of view was measured as 39° with 0.5° deviation from the center of view.