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

本论文主要研究了利用波带片阵列和高分辨率LCTV-SLM进行实时光学加工的方法，主要结果如下：1）二元光学元件的检测：波带片由于其平面结构和设计的灵活性，是一种适用于并行加工系统的器件。通过增加相位级的数目，可以提高波带片在光学加工中的充分利用率。讨论了基于衍射光学的多级波带片阵列的设计方法和制作技术。通过计算机模拟，预测了聚焦效率、焦斑尺寸和焦平面光强分布。聚焦效率达到85%的实验性能。这些多级波带片提供了与傅里叶变换透镜相同的良好的相关峰和良好的性能。利用这些方法，我们制作了三能级阵列照明器， 关于我们 2）LCTV-SLM的特性：LCSLM的器件限制是光学处理性能的决定性因素。为了理解有限分辨率对系统性能的影响，对系统进行了理论分析和最终设计。3）基于JTC的实时光学并行处理：采用高分辨率LCTV-SLM和二元波带片进行光学并行处理。然后，对实时光学传感器进行了仿真。讨论了通过正面人脸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来改善光学操作的可能性。实验结果与理论结果吻合较好。我们设计并制作了一个5通道的二元波带片阵列，并获得了人脸正面图像的并行互相关信号。然而，我们乐观地认为，在未来5年内，这些问题将通过制造适合光学加工目的的优化解决。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