Optimization of gratings in a diffractive waveguide using relative-direction-cosine diagrams

• DOI: 10.1364/oe.433515
• Publication Date: 2021-10-12T21:00:22Z
• Authors: Deqing Kong; Zheng Zhao; Xiaogang Shi; Xiaojun Li; Bingjie Wang; Zhenghui Xue; ShuangLong Li
• Keywords: Monochromatic color; Waveguide; Diffraction efficiency

Designing diffractive waveguides for head-mounted displays requires wide-angle conical diffraction analysis of multiple gratings. In this work, waveguide design using the relative direction cosine space, which extends space to a involving refractive indices and can describe grating through various media, is demonstrated. A was fabricated with periods 382 270 nm, generated monochromatic virtual image in green light (520 nm). The maximum field view measured as 39° 0.5° deviation from center view.