Breaking the in-coupling efficiency limit in waveguide-based AR displays with polarization volume gratings
作者机构：College of Optics and PhotonicsUniversity of Central FloridaOrlandoFL 32816USA Joint International Research Laboratory of Information Display and VisualizationSoutheast UniversityNanjing 210096China Meta Reality Labs Research9845 Willows Road NERedmondWA 98052USA
出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)
年 卷 期：2024年第13卷第9期
页 面：1919-1930页
核心收录：
学科分类：070207[理学-光学] 07[理学] 0702[理学-物理学]
基 金：Meta Platforms Technologies
主 题：polarization waveguide coupling
摘 要：Augmented reality(AR)displays,heralded as the next-generation platform for spatial computing,metaverse,and digital twins,empower users to perceive digital images overlaid with real-world environment,fostering a deeper level of human-digital *** the rapid evolution of couplers,waveguide-based AR displays have streamlined the entire system,boasting a slim form factor and high optical ***,challenges persist in the waveguide combiner,including low optical efficiency and poor image uniformity,significantly hindering the long-term usage and user *** this paper,we first analyze the root causes of the low optical efficiency and poor uniformity in waveguide-based AR *** then discover and elucidate an anomalous polarization conversion phenomenon inherent to polarization volume gratings(PVGs)when the incident light direction does not satisfy the Bragg *** new property is effectively leveraged to circumvent the tradeoff between in-coupling efficiency and eyebox *** feasibility demonstration experiments,we measure the light leakage in multiple PVGs with varying thicknesses using a laser source and a liquid-crystal-on-silicon light *** experiment corroborates the polarization conversion phenomenon,and the results align with simulation *** explore the potential of such a polarization conversion phenomenon further,we design and simulate a waveguide display with a 50°field of *** achieving first-order polarization conversion in a PVG,the in-coupling efficiency and uniformity are improved by 2 times and 2.3 times,respectively,compared to conventional *** groundbreaking discovery holds immense potential for revolutionizing next-generation waveguide-based AR displays,promising a higher efficiency and superior image uniformity.
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