手性液晶在DMD光刻系统下的衍射性能研究  

Research on Diffraction Performance of Chiral Liquid Crystal in DMD Lithography System

作　　者：孙皖豫 SUN Wan-yu(Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学,广东广州510006

出　　处：《电脑知识与技术》2021年第25期24-27,共4页Computer Knowledge and Technology

摘　　要：将光敏手性剂添加到向列型液晶中制成光学器件,把器件放在DMD光刻系统中,添加365nm的UV光诱导液晶手性发生变化,再用红光透过样品从而观察衍射效应。光刻系统分别投影纯白,黑白条纹两种不同的图片作为掩模版,观察出射偏振态的变化和衍射效率。纯白下的出射光偏振态会随着光强的增大而顺时针偏转,但是光强不变。黑白条纹下的衍射角度随着UV光强的增大同样顺时针偏转,而衍射效率和响应速度也随着UV光强的增大而增大。无论是均匀还是周期的UV光照射,都能调制输出光(前者是调制0级,后者是衍射1级)的偏振态。Add the photosensitive chiral agent to the nematic liquid crystal to make an optical device,place the device in the DMD lithography system,add 365nm UV light to induce a change in the chirality of the liquid crystal,and then use red light to pass through the sample to observe the diffraction effect.The lithography system respectively projected two different pictures of pure white and black and white stripes as masks to observe the changes in the output polarization state and the diffraction efficiency.The polarization state of the outgoing light under pure white will be deflected clockwise as the light intensity increases,but the light intensity does not change.The diffraction angle under the black and white fringes is also deflected clockwise with the increase of UV light intensity,and the diffraction efficiency and response speed also increase with the increase of UV light intensity.Regard⁃less of whether it is uniform or periodic UV light irradiation,it can modulate the polarization state of the output light(the former is modulated 0 order,the latter is diffraction 1 order)to realize optically adjustable polarization optical devices,which can be used for optical communication and information processing.

关 键 词：DMD 手性剂 衍射 液晶光栅 光敏材料 

分 类 号：TN141.9[电子电信—物理电子学]