增强现实显示光学引擎中光波导耦出超表面设计(特邀)  

Design of waveguide decoupled metasurface for augmented reality display optical engine(invited)

作　　者：陈恩果 陈慷慷 范祯桂 孙志林 林子健 张恺馨 孙捷 严群 郭太良 Chen Enguo;Chen Kangkang;Fan Zhengui;Sun Zhilin;Lin Zijian;Zhang Kaixin;Sun Jie;Yan Qun;Guo Tailiang(National and Local Joint Engineering Laboratory of Flat Panel Display Technology,College of Physics and Information Engineering,Fuzhou University,Fuzhou 350108,China;Fujian Optoelectronic Information Science and Technology Innovation Laboratory(Mindu Innovation Laboratory),Fuzhou 350108,China)

机构地区：[1]福州大学物理与信息工程学院平板显示技术国家地方联合工程实验室,福建福州350108 [2]中国福建光电信息科学与技术创新实验室(闽都创新实验室),福建福州350108

出　　处：《红外与激光工程》2023年第7期113-122,共10页Infrared and Laser Engineering

基　　金：国家自然科学基金面上项目(62175032);福建省区域发展项目(2023H41010008);漳州市科技重大专项(202110051);闽都创新实验室自主部署项目(2020ZZ111)。

摘　　要：增强现实(AR)近眼显示光学引擎是新型显示光学设计领域的研究热点之一,它将虚拟图像投射到现实物理环境中进行显示,在空间上增强、融合和补充了物理世界。AR近眼显示光学引擎在光学系统集成化和微型化方面有较高要求,眼镜形态的AR近眼显示光学设备是未来必然发展趋势。光学超表面是一种由亚波长单元结构在二维平面上周期排布而成的人工结构阵列,通过单元结构和电磁波的相互作用实现对光场中振幅、相位和偏振的任意调控,同时具有体积小、效率高、结构紧凑等特点,在近眼显示应用中具有很大潜力。文中在AR光学引擎设计中引入一种传输相位型超表面光波导耦出结构,该超表面单元引入了突变相位,通过对超表面的等相位面调控改变光经过波导耦出的角度,使出射光效率最高达到77%,并实现20°视场角,为AR光波导结构设计提供一种可行方案,有望为下一代人机交互显示平台提供解决方案。Object The optical engine design of augmented reality(AR)near-eye display is one of the research hotspots in the field of display technology.It projects virtual images to the real physical environment for display,and simultaneously enhances,merges,and complements the physical world in space.AR near-eye display optical engine has high requirements for the integration and miniaturization of optical system,and the glass-like AR neareye display optical device is an inevitable development trend in the future.Optical metasurface is an artificial structure array composed of subwavelength unit structure periodically arranged on a two-dimensional plane.It realizes arbitrary regulation of the amplitude,phase,and polarization of the light field through the interaction of the unit structure and electromagnetic wave.At the same time,it has the characteristics of small size,high efficiency,and compact structure,and has great potential in near-eye display applications.Methods In this paper,a metasurface structure is designed as the decoupled structure of the AR near-eye display optical waveguide(Fig.1).The decoupled part adopts a waveguide with a cutting angle of 60°.By changing the angle of incident light,the incident light propagates inside the waveguide at 50°-75°.The coupled part of the metasurface has a height of 900 nm and a radius of 50-120 nm(Fig.6).The AR near-eye display optical waveguide is simplified and simulated in FDTD.The light source is placed inside the waveguide to simulate the total reflection of the incident light,and the decoupling angle is simulated by changing the incident angle.Results and Discussions When the collimated light is incident into the metasurface structure,the outgoing light deviates from the z-axis by−35°(Fig.7).The field intensity distribution is observed by placing a monitor or far-field calculation,and the deflection efficiency is calculated to reach 77%.In addition,the angle distribution of the outgoing light on the metasurface within the designed wavelength of±30 nm is simulat

关 键 词：近眼显示 光波导 超表面 传输相位 增强现实 光束偏转 

分 类 号：TN27[电子电信—物理电子学] TN761