基于各向异性晶体的光学微分运算  

Anisotropic crystals based optical differential operation

作　　者：余晨 杨华 陈书圆 Yu Chen;Yang Hua;Chen Shu-Yuan(College of Computer Science and Electronic Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学信息科学与工程学院,长沙410082

出　　处：《物理学报》2021年第5期133-138,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61275137);长沙市重点研发项目(批准号:190102)资助的课题.

摘　　要：光学微分运算是边缘图像的光学检测核心原理,与传统的数字图像处理方法相比,具有效率高、结构简单且无需考虑算法和功耗等优点.本文提出一种基于各向异性晶体的光学微分运算装置,用定制的晶体片实现光的空间分化,从而实现多角谱分量下的全方位边缘成像.本文中的方案需要将光束的左右旋圆偏振分量横向分离,再对中间部分的线偏振光进行滤波处理.该方案主要是基于各向异性晶体的双折射效应,整个装置整合为一条笔直的光路,与自旋霍尔效应和超表面相比,具备原理简单、成本较低且成像稳定的优点,不过对晶体的厚度有较高的要求.实验结果也较为理想地验证了此方案,未来可望在量子观测、生物细胞和医学等领域实现一定潜在应用.Optical differential operation is the core principle of optical detection of edge images.Compared with the traditional digital image processing methods,the optical differential operation has high efficiency,simple structure,and needless to consider algorithms and power consumption.An optical differential operation device based on anisotropic crystal is proposed in this paper.Omni-directional edge imaging under multi-angle spectral components is realized by using a customized crystal chip.The scheme is mainly based on the birefringence effect of anisotropic crystal.It needs to separate the left and right circularly polarized component of the beam horizontally,and then filter the linearly polarized light in the middle.The whole device is integrated into a straight optical path.Although it has higher requirements for the thickness of crystal,it is simpler,cheaper and more stable than spin Hall effect and super surface principle.The experimental results also demonstrate that the scheme can be used in quantum observation,biological cell and medicine.

关 键 词：各向异性晶体 光学微分 边缘成像 双折射 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] O439[自动化与计算机技术—计算机科学与技术]