Research on real-time optical parallel processing using zone plate array and high resolution liquid crystal SLM

在这项研究中，我们利用波带板阵列和高分辨率LCTV-SLM进行了实时光学处理的研究，得到了以下主要结果：1)二元光学元件的检测：波带板的平面结构和设计上的灵活性使其适合于并行处理系统。波带片用于光学加工的充分效率可以通过增加位相级数来提高。讨论了基于衍射光学的多级波带板阵列的设计方法和制作技术。进行了计算机模拟，预测了聚焦效率、光斑大小和焦平面上的强度分布。实验获得了85%的聚焦效率。这些多能级波带片提供了与傅里叶变换透镜相同的定义良好的相关峰和良好的性能。利用这些方法，我们制作了适用于大尺寸…的三能级阵列光源LCTV-SLM的特性：LCSLM的器件限制是影响光学处理性能的决定性因素。3)基于JTC的实时光学并行处理：采用高分辨率LCTV-SLM和二值波带片进行光学并行处理。然后，搭建了实时光学相关器。讨论了利用人脸正面图像的模式匹配进行识别的可能性，以及通过引入数字预处理改进光学操作的可能性。实验结果与理论互相关结果吻合较好。设计并制作了5个通道的二值波带板阵列，获得了人脸正面图像的并行互相关信号，从运算速度上看，目前器件分辨率和运算速度仍然较低。然而，我们乐观地认为，在未来5年内，这些问题将随着适合于光学加工目的的优化制造而得到解决。较少

In this research, we have been investigated for real-time optical processing using the zone plate array and high resolution LCTV-SLM.We found the following main results :1) Examination of binary optical elements :A zone plate is an suitable device for parallel processing systems, because of its plane structure and flexibility in design. The sufficient efficiency of zone plate used for optical processing can be improved by increasing the number of phase level. The design method and fabrication techniques of multi-level zoneplate array based on diffractive optics were discussed. Computer simulation was done providing the predictions of focusing efficiencies, spotsize and the intensity profile at the focal plane. The experimental performance of focusing efficiency of 85% was achieved. These multi-level zone plate provided a well defined correlation peak and good performance provided same as by the Fourier ttransform lens. Using these method, we fabricated 3-level array illuminator for lar … More ge apearture phase-only spatial light modulators.2) Characteristics of LCTV-SLMs :The device limitations of the LCSLM was decisive factors in the performance of a optical processing. In order to understand te effects caused by limited resolution, theoretical and eventual design of the system was attempted.3) Real-time optical parallel processing based on JTC :A high-resolution LCTV-SLM and a binary zone plate were applied to optical parallel processing. Then, the real-time optical correlators was constracted. The possibility of recognition by pattern matching of front facial images and improvement of optical operation by introducing the digital pre-processing was discussed. Good correspondence of experimental and theoretical cross-correlation results were obtained. We designed and fabricated a binary zone plate array with 5 channels and obtained parallel cross-correlation signals of front facial images.In terms of performsnce speed, at present, we recognize the device resolution and operation speed are still low. However, we are optimistic that in the next 5 years these problems will be solved with the fabrication of optimized suited for purposes in optical processing. Less