基于增强现实显示的双通道光波导元件设计  

Design of Dual-channel Optical Waveguide Elements Based on Augmented Reality Display

作　　者：牟达[1] 谢蕙阳 吴博琦 张易 秦箫 MU Da;XIE Huiyang;WU Boqi;ZHANG Yi;QIN Xiao(School of Opto-Electronic Engineering,Changchun University of Science and Technology,Changchun 130022;School of Electrical and Computer Science,Jilin Jianzhu University,Changchun 130018)

机构地区：[1]长春理工大学光电工程学院,长春130022 [2]吉林建筑大学电气与计算机学院,长春130018

出　　处：《长春理工大学学报（自然科学版）》2024年第5期1-8,共8页Journal of Changchun University of Science and Technology(Natural Science Edition)

基　　金：吉林省科技发展计划项目(20210203164SF)。

摘　　要：增强现实(AR)是一种将虚拟影像叠加到现实环境的显示设备,在军事、医疗等领域具有广阔的应用前景。为提高AR显示系统的视场角,使用亚波长光栅作为双通道光波导耦合元件,基于矢量衍射理论调制光栅±1级衍射效率,并通过严格耦合波分析法(RCWA)对光栅进行仿真分析。仿真结果显示,单通道波导结构在50°视场下衍射效率在60%以上,双通道波导结构在100°视场下平均衍射效率达到70%以上,且双通道波导在400~800 nm波段范围内最低衍射效率在60%以上,转置光栅分区反射效率分别为30%、35%、32%。结果表明,相较单通道波导,双通道波导结构可以实现更大的视场角。Augmented reality is a display device that overlays virtual images into the real environment,which has a broad application prospect in military,medical and other fields.In order to improve the field of view angle of the AR display system,the sub-wavelength grating is used as the dual-channel optical waveguide coupling element.The±1 order diffraction efficiency of the grating is modulated based on the vector diffraction theory,and the grating is simulated and analyzed by strict coupled wave analysis(RCWA).The simulation results show that the diffraction efficiency of single-channel waveguide structure is more than 60%in 50°field of view,the average diffraction efficiency of dual-channel waveguide structure is more than 70%in 100°field of view,and the lowest diffraction efficiency of dual-channel waveguide in 400~800 nm band is more than 60%.The reflection efficiency of transposed grating is 30%,35%and 32%,respectively.The results show that the dual-channel waveguide structure can achieve a larger field of view angle than the single-channel waveguide.

关 键 词：增强现实 视场角 严格耦合波分析 衍射光波导 表面浮雕光栅 

分 类 号：TN26[电子电信—物理电子学]