传统的多涡旋光束多为离轴光束，需要更精密的镜头、光路复杂且成像质量差，限制了其应用。本文设计并制备了一种基于液晶器件的复合q-plate，其透射效率大于95%，同时可生成同轴复合涡旋光束。通过理论和实验证明了该器件生成的复合涡旋光束的传播特性，该光束具有自旋和长距离衍射后自愈等新颖的衍射现象，生成的同轴复合涡旋光束避免了传统多涡旋光束离轴的缺点。此研究为粒子捕获和操控、光信息处理、光学加密和光学测量等领域的应用提供了全新的手段。

Flat optical elements have attracted enormous attentions and act as promising candidates for the next generation of optical components. As one of the most outstanding representatives, liquid crystal (LC) has been widely applied in flat panel display industries and inspires the wavefront modulation with the development of LC alignment techniques. However, most LC elements perform only one type of optical manipulation and are difficult to realize the multifunctionality and light integration. Here, flat multifunctional liquid crystal elements (FMLCEs), merely composed of anisotropic LC molecules with space-variant orientations, are presented for multichannel information manipulation by means of polarization, space and wavelength multiplexing. Specifically, benefiting from the unique light response with the change of the incident polarization, observation plane, and working wavelength, a series of FMLCEs are demonstrated to achieve distinct near- and far-field display functions. The proposed strategy takes full advantage of basic optical parameters as the decrypted keys to improve the information capacity and security, and we expect it to find potential applications in information encryption, optical anti-counterfeiting, virtual/augmented reality, etc.

通常用混合阶庞加莱球的方法描述任意矢量涡旋光束，该方法可以使其偏振与相位演化的物理过程变得更加直观。目前，人们常用空间光调制器、超表面与螺旋相位板的组合、激光谐振腔等来产生矢量涡旋光束。然而，这些方法所产生的光束通常只限于特定的偏振态，且具有低损伤阈值、低转换效率和大结构尺寸等缺点，并且这些方法通常只能实现同一混合阶庞加莱球上的适量涡旋光束的产生与切换。本文提出了一种利用电控可调液晶q板和波片通过纯电控手段来实现两个不同阶混合阶庞加莱球上任意矢量涡旋光束的随意产生与切换。通过理论和实验对其结果进行验证，与预期仿真结果基本保持一致。此方法具有良好的电可控性、集成性好、转换效率高等优点，并且可以为结构化光束的应用提供基本的光学系统支持。

运动恢复结构算法(structure from motion, SfM)是一种通过计算图像匹配关系，恢复出相机位姿和目标三维结构的重建算法。提出一种基于赋权视角连接图的增量式运动恢复结构算法。首先建立基于图像对立体匹配质量的赋权连接图，量化了图像两两之间的匹配关系；其次在赋权连接图中边的权重的基础上，搜索度数感知的最佳初始种子对；最后根据已重建顶点的连通性构建下一张最佳图像候选集，设计了基于顶点度数与特征点分布的下一张最佳图像评价算法。在公开数据集上实验结果显示，本文算法在重建质量、相机校准率和点云生成数量的表现优于现有先进的运动恢复结构算法，相比基准对比算法，本文算法在不同数据集上平均重建耗时至少降低了19%，点云生成速率至少提升了21%。

Optical edge detection, a part of image processing, plays an important role in extracting image information used in optical analog computation. In this Letter, we raise a new way to realize optical edge detection. This design is based on two liquid crystal polarization gratings with a period of 2.2 mm, which function as a spatial differentiator. We experimentally demonstrate broadband optical detection and real-time adjustable resolution. The proposed method takes advantage of the convenience to use, simple fabrication process, and real-time tunable resolution. It may guide more significant applications in the optical field and other practical scenarios like machine vision in computers.