应用于彩色光波导显示中的液晶偏振体光栅结构设计与制备  

Design and fabrication of liquid crystal polarizing grating used in color optical waveguide display

作　　者：阚丽娜 穆全全[1,3] 彭增辉 杨程亮[1,3] 于洋 刘永刚[1,3] 王启东 KAN Lina;MU Quanquan;PENG Zenghui;YANG Chengliang;YU Yang;LIU Yonggang;WANG Qidong(State Key Laboratory of Applied Optics,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Optical System Advanced Manufacturing Technology,Chinese Academy of Sciences,Changchun 130033,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室,吉林长春130033 [2]中国科学院大学材料科学与光电子工程中心,北京100049 [3]中国科学院光学系统先进制造技术重点实验室,吉林长春130033

出　　处：《液晶与显示》2024年第4期427-435,共9页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金(No.U2241224,No.11974345,No.61975202,No.U2030101)。

摘　　要：本文设计并实现了一种三层结构液晶偏振体光栅,对其衍射特性及其在光波导中的耦合情况进行了研究。理论上,选取横向周期为424 nm,根据特定工作波长450 nm、532 nm、633 nm在满足布拉格衍射条件的情况下计算出了相对应的3个纵向周期以实现其厚度方向的叠加。采用有限元法对该器件进行了模拟仿真,计算出了其光谱特性及角度特性,根据红绿蓝三色光色散关系仿真出了其在波导内耦合的入射角与衍射角之间的关系曲线。实验上,本文实现了该液晶偏振体光栅器件的制备并对其进行了系统性能表征,给出了一个初步的光波导耦合实验,演示了其耦合效果。结果表明,所制备的三层液晶偏振体光栅器件在450 nm、532 nm、633 nm下衍射效率最高可达80%以上,对应波长下的角带宽分别为12°、8°、6°,其在波导内耦合的视场经模拟可达到27.81°,是一种良好的光波导耦合器件。In this paper,a three-layer liquid crystal polarization grating is designed and implemented,and its diffraction characteristics and coupling in optical waveguide are studied.In theory,the transverse period of 424 nm is selected,and the corresponding three longitudinal periods is calculated according to the specific working wavelength of 450 nm,532 nm and 633 nm to achieve the superposition of the thickness direction under the condition of Bragg diffraction.Secondly,the finite element method is used to simulate the device.Finally,the relationship between the incident angle and the diffraction angle coupled in the waveguide is simulated according to the red,green and blue light dispersion relationship.The liquid crystal polarization grating device is fabricated and its system performance is characterized.A preliminary optical waveguide coupling experiment is given to demonstrate its coupling effect.The results show that the diffraction efficiency of the prepared three-layer liquid crystal polarization grating device can reach more than 80%at 450 nm,532 nm and 633 nm,and the angular bandwidth of the corresponding wavelength is 12°,8°and 6°,respectively.The field of view of the device coupled in the waveguide can reach 27.81°by simulation,which is a good optical waveguide coupler.

关 键 词：光学器件 角度响应 衍射效率 液晶偏振体光栅 

分 类 号：O753.2[理学—晶体学] O436[机械工程—光学工程]