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Chinese Journal of Liquid Crystals and Displays

Chinese Journal of Liquid Crystals and Displays Chinese Journal of Liquid Crystals and Displays
  • Editor-in-Chief:Haicheng Guo
  • ISSN:1007-2780
  • eISSN:2097-3217
  • CN:22-1259/O4
  • Supervisor:Chinese Academy of Sciences
  • Sponsor:Changchun Institute of Optics, Fine Mechanics, and Physics (CIOMP), CAS, Liquid Crystal Branch, Chinese Physical Society, and Liquid Crystal Branch
  • Publication frequency:Monthly
  • Address:No.3888 Dong Nanhu Road, Changchun, Jilin, China 130033
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Volume 41 期 2，2026 2026年第41卷第2期

  • Material Physics

    “蓝相液晶在电光器件领域应用前景广阔，但聚合作用中光致异构化会扰乱液晶分子排列。专家研究了温度控制对聚合作用中光致异构化和晶格结构的影响，发现聚合物加入促使液晶蓝相Ⅰ晶格常数发生跃变，避免在温域中间段聚合可防止晶格畸变和光谱展宽。”

    YANG Xinyu, SANG Shu, XU Xiaowan

    DOI：10.37188/CJLCD.2025-0234
    摘要：Blue phase liquid crystals（BPLCs） possess several extraordinary optical properties， such as fast response time （sub-milliseconds）， Bragg reflection in visible range， optical isotropic property. Meanwhile， polymer-stabilized blue phases LC（PSBPLCs） expanded the temperature range of BPLCs， which makes PSBPLCs have a good application in electro-optical devices. However， photoisomerization perturbs the arrangement of liquid crystal molecules， which induces defects in lattice structures. Herein， we introduce temperature control in photo polymerization. Pure liquid crystal samples and unpolymerized samples of BPLC are tested to find out the relationship between temperature and lattice constants. Based on temperature properties， lattice structures are observed at three different temperature region. Experimental results indicate that the lattice constants of blue phase Ⅰ （BPⅠ） change discretely （about 40 nm） after introducing liquid crystal polymer. Therefore， polymerizing in addition to mid-temperature region could avoid distortion of lattice structures and broadening of spectrum.  
    关键词：polymer-stabilized blue phase liquid crystals;lattice structure;temperature control   
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  • Device Physics and Device Preparation

    “研究了碳量子点掺杂对聚合物分散液晶复合材料的影响，分析了其对形貌结构、极化机制及荧光调控效果的作用，为开发PDLC复合材料提供了有价值的参考。”

    LU Siyu, LIU Yourong, CAI Jia, XU Hai, LIU Yuan, ZHENG Jihong

    DOI：10.37188/CJLCD.2025-0217
    摘要：This study investigates the morphological structure， polarization mechanism， and fluorescence regulation effect of Polymer Dispersed Liquid Crystal（PDLC） composite materials doped with Carbon Quantum Dots（CQDs） nanomaterials. Based on the micro-morphological structure of PDLC films， the influence of this structure on liquid crystal droplet size is analyzed. Using dielectric measurement data and Cole-Cole plots， the CQDs-induced non-Debye relaxation polarization process of the composite film under different frequencies is studied， while the effects of CQDs doping on relaxation time and relaxation distribution parameter are also analyzed. Furthermore， the impacts of these two factors on the electro-optical properties of the films are explored. Under the synergistic regulation of CQDs mass fraction and exposure intensity， the effects of PDLC’s dielectric properties and scattering performance on the film’s fluorescence performance are investigated. The experimental results show that： when the CQDs doping amount is 0.2% （mass fraction）， compared with undoped PDLC， the relaxation time of the PDLC composite film decreases by 56%， and the threshold voltage and saturation voltage decrease by 19.9% and 11.8% respectively， and the on-state and off-state switching response times decrease from 32 ms and 50 ms to 10 ms respectively； when the exposure intensity decreases from 30 mW/cm2 to 1 mW/cm2， the peak fluorescence intensity of PDLC increases by approximately 130%. This work effectively realizes the synergistic improvement of electro-optical properties and fluorescent characteristics of PDLC， providing valuable insights for the development of PDLC composite materials.  
    关键词：polymer-dispersed liquid crystal;carbon quantum dot;dielectric properties;fluorescent   
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    “交叉型液晶偏振体光栅（PVG）二维扩瞳光波导因其结构紧凑和制备便捷性成为AR显示的研究热点。然而，其用于AR显示的视场角（FOV）受到双波导堆叠技术方案的限制。为提升此类波导的视场角，本文提出一种基于单层高折射率玻璃基板（n=1.9）并在其正反双面集成左手、右手手性PVG的光波导架构。其中，耦入端和耦出端左右手性光栅倒格矢的水平方位夹角分别为0°和60°。入射光经PVG的偏振选择性被分束为两条全内反射路径；当耦入和耦出光栅对光提供的合倒格矢为0时被部分耦出，并形成完整的二维扩展光瞳。我们基于光栅衍射方程和玻璃折射率推导了视角中心为波导垂直方向时对应的PVG光栅周期，并通过COMSOL仿真验证了532 nm准直光垂直入射的耦入机制。实验制备的样机实现出瞳光栅尺寸28 mm × 22 mm，视场角达水平32.8°、垂直18.7°、对角线37.8°，对角线视场角较前期研究提升26%。该设计通过在基板双面直接制备PVG光栅，省去了传统胶合工艺，避免了折射率匹配胶水和基底材料的严苛选择需求，显著简化了制备流程并有效降低了制造成本。该方案还利用高折射率基板显著增大了FOV，同时提升了成像质量，为AR头戴近眼显示提供了一种具有前景的高性能方案。#模板#，介绍了其在AR显示领域的研究进展，专家提出了一种基于单层高折射率玻璃基板的光波导架构，为提升视场角提供解决方案。”

    ZHONG Liangzhihuang, CHEN Quanming, LUO Dan

    DOI：10.37188/CJLCD.2025-0242
    摘要：Cross type liquid crystal polarization volume grating（PVG）-based two-dimensional pupil expansion waveguides have emerged as a research hotspot in AR displays due to their compact structure and fabrication simplicity （no dynamic adjustment of interference angles is required during holographic exposure）； however， their field of view（FOV） for AR applications is constrained by traditional dual-waveguide stacking approaches. To enhance the FOV， this work proposes an optical waveguide architecture based on a single-layer high-refractive-index glass substrate （n=1.9） coated with left-handed and right-handed PVGs on both surfaces， where the horizontal azimuthal angles of the reciprocal lattice vectors for the input-coupler and output-coupler gratings are 0° and 60°， respectively. Incident light is split into two separate total internal reflection paths via PVG polarization selectivity； partial out-coupling occurs when the combined reciprocal lattice vector provided by the input and output gratings sums to zero， forming a complete two-dimensional expanded exit pupil. Based on the grating diffraction equation and substrate refractive index， we derived the required PVG period for the central FOV aligned with the waveguide normal direction. In addition， the input-coupling mechanism for vertically incident 532 nm collimated light is validated via COMSOL simulations. The fabricated prototype （28 mm × 22 mm output grating） achieved a 32.8° （horizontal） × 18.7° （vertical） FOV （37.8° diagonal）， representing a 26% improvement in the diagonal FOV over prior work. This design eliminates traditional bonding processes by direct dual-side PVG fabrication， circumventing stringent requirements for index-matching adhesives/substrates， significantly simplifying fabrication process and reducing costs. The high-refractive-index substrate further increases FOV while enhancing image quality， providing a promising high-performance solution for AR near-eye displays.  
    关键词：liquid crystal polarization volume grating;field of view;two-dimensional exit pupil expansion;waveguide-based AR display;liquid crystal optics   
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    “介绍了其在工业检测领域的研究进展，专家优化了SD-OCT系统性能，提升了分辨率与扫描范围，为多层结构测量提供解决方案。”

    ZHOU Ying, WANG Chen, WU Jingjing, YU Lin, HU Lifa

    DOI：10.37188/CJLCD.2025-0232
    摘要：Spectral Domain Optical Coherence Tomography（SD-OCT） systems have been extensively studied for biological tissue measurement， featuring non-invasiveness， micron-level resolution， and real-time detection capabilities. To expand their application scope to the measurement of industrial products with multilayer structures， it is necessary to optimize the performance of SD-OCT systems. Firstly， this study optimizes the parameters of the sample arm field lens using ZEMAX. Aberrations are reduced by adjusting the lens curvature， focal length， and optical path layout， and a matched scanning lens is designed to expand the detection range. Secondly， the spectrometer parameters are optimized： appropriate lenses and gratings are selected， and the optical path layout and device tilt angle are adjusted to improve spectral resolution and imaging depth. Finally， MATLAB is used to establish a simulation model for the system’s axial resolution， which supports tomographic imaging simulation experiments of multilayer sample structures. The results show that the comprehensive performance of the optimized SD-OCT system is significantly improved. The lateral resolution is enhanced to 20 µm， while a large scanning range of 34 mm×34 mm is achieved. The imaging depth is increased to 2.44 mm， enabling effective penetration of multilayer industrial structures. The axial resolution is verified by simulation to be 6.40 µm， with the simulation results highly consistent with the theoretical calculation values. Additionally， the tomographic imaging simulation of multilayer sample structures is successfully realized. The proposed optimization design method for the SD-OCT system provides valuable reference and promotion for its applications in other fields.  
    关键词：ZEMAX;spectral-domain optical coherence tomography;resolution;imaging depth;spectrometer   
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