摘要
在近眼显示领域中,体全息光栅作为有前景的技术,起到将光耦合/耦出波导器件的作用。液晶偏振全息元件具有很强的偏振选择性和转换性能,不仅可以实现光的耦合,还可作为光开关、透镜、光栅、漫射器、消色差器件及彩色光学器件等使用。本文采用光控取向技术结合全息光路制备了液晶偏振全息柱透镜并对其成像特性进行了研究。在离轴全息干涉光路上利用平面波和柱面波干涉的方法,利用SD1光控取向技术制备了变间距液晶偏振衍射透镜。在457 nm激光全息曝光的条件下制备了21.96°、26.42°、33.20°3种曝光夹角的全息柱透镜样品,并对应不同变间距周期的液晶偏振透镜。在偏光显微镜下,均观测到偏振全息柱透镜光栅周期的显著变化,并实现偏振全息的柱面聚焦再现。本文对液晶偏振透镜的基本全息衍射特性与反常色散特性进行了实验分析和验证。
In the field of near-eye display,volume holographic gratings,as the promising coupling elements,can couple the light into and out of the waveguide.Liquid crystal polarization hologram has strong polarization selectivity and conversion performance,which can not only realize the coupling of light,but also be used as optical switch,lens,grating,diffuser,achromatic and color optical elements.In this paper,liquid crystal polarization holographic cylindrical lenses were prepared by photo-alignment liquid crystal technology combined with holographic optical path,and their imaging characteristics were studied.In the off-axis holographic interferometric optical path,with the method of the interference of plane wave and cylindrical wave,the SD1 photocontrol orientation technology was used to fabricate a variable line spacing liquid crystal polarization diffraction lens.After being exposed to a 457 nm laser holography,samples of holographic column lenses were prepared with exposure angles of 21.96°,26.42°,and 33.20°,respectively.These angles corresponded to liquid crystal polarizing lenses with varying spacing periods.The change of the period can be realized by changing the angle between the two interference light beams which verified by theoretical calculation.Subsequently,the diffraction characteristics and anomalous dispersion characteristics of liquid crystal polarizing lens were analyzed experimentally.The results indicate that liquid crystal polarization holographic elements have enormous potential in the field of near eye displays.
作者
邢陈陈
郑继红
陈芳芳
马陈文
桑景新
刘悠嵘
XING Chenchen;ZHENG Jihong;CHEN Fangfang;MA Chenwen;SANG Jingxin;LIU Yourong(School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《液晶与显示》
CAS
CSCD
北大核心
2024年第5期593-601,共9页
Chinese Journal of Liquid Crystals and Displays
关键词
光控取向
液晶
偏振柱透镜
反常色散
photoalignment
liquid crystal
polarizing cylindrical lens
anomalous dispersion
