物理学报2025，Vol.74Issue(7)：179-188,10.DOI:10.7498/aps.74.20241794
反射式光取向液晶偏振体全息柱透镜的特性
Characteristics of reflective liquid crystal polarization holographic cylindrical lenses
摘要
Abstract
Photo-oriented liquid crystal technology utilizes polarized light illumination to achieve the directional alignment of liquid crystal molecules.This technology can be developed into polarization volume gratings(PVGs),which possess polarization and volume holographic selectivity characteristics,and also have a broad application prospect as an optical coupling element in optical waveguides and for pupil expansion output.This paper reports on the fabrication of a liquid crystal polarization volume holographic cylindrical lens(PVLS)with a beam diameter of 2 cm by using photo-oriented technology combined with a polarization off-axis holographic optical path.During the experiment,the exposure angle can be controlled to achieve the desired grating period variation range,enabling the diffraction angles of red,green,and blue light incident on different grating periods to be the same.The experimental results show that within the grating period variation range from 1721.2 to 5346.5 nm,when the red,the green,and the blue light are incident on grating with periods of 3147 nm,2649.1 nm,and 2275.6 nm respectively,the measured diffraction angles are all 11.59°,with an error between the actual and theoretical diffraction angles within±0.5°;under 532-nm right-handed circularly polarized light,the diffraction efficiency for 18 normal incidence reaches 90.6％,and the diffraction efficiency for oblique incidence satisfying the Bragg condition is 84.4％;simultaneously,beam expansion in one-dimensional direction is achieved,preliminarily verifying the feasibility of PVLS application in the field of color waveguides.关键词
光控取向/液晶/变间距偏振光栅/光波导Key words
photocontrolled orientation/liquid crystal/variable spacing polarization grating/optical waveguide引用本文复制引用
马陈文,陈芳芳,郑继红..反射式光取向液晶偏振体全息柱透镜的特性[J].物理学报,2025,74(7):179-188,10.基金项目
国家自然科学基金(批准号:62475158)资助的课题. Project supported by the National Natural Science Foundation of China(Grant No.62475158). （批准号:62475158）
