螺旋型波带片成像特性研究  

Study on the Imaging Performance of Spiral Zone Plate

作　　者：易涛[1] 董建军[1] 朱效立[2] 杨国洪[1] 刘慎业[1] 

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900 [2]中国科学院微电子研究所,北京100029

出　　处：《光学学报》2010年第3期753-757,共5页Acta Optica Sinica

基　　金：国家863计划(2008AA804118);国家自然科学基金(10727504)资助课题

摘　　要：研究了螺旋型波带片的成像特性。螺旋型波带片是一种新型成像元件,能够实现光学希尔伯特变换,获取边缘增强图像。采用快速傅里叶变换算法对螺旋型波带片的成像进行了数值模拟,分析了其成像特性并实验进行验证。通常螺旋型波带片作为空间滤波器要求物距满足夫琅禾费(Fraunhofer)衍射条件,理论计算表明在某些菲涅耳(Fresnel)衍射区域内螺旋型波带片仍可获得良好的成像效果,因此螺旋型波带片的实际视场比根据夫琅禾费衍射条件限定的视场要大。实验结果与数值模拟的吻合很好。因此利用快速傅里叶变换算法对螺旋型波带片成像质量模拟可以有效评估成像质量,对螺旋波带片显微镜的设计有重要的指导意义。The imaging performance of spiral zone plates is studied.Spiral zone plate is a new imaging optic device which can implement optical Hilbert transform and produce the edge-enhanced imaging of an object,is presented. The performance of spiral zone plates is numerically analyzed using fast Fourier transform and the working condition of spiral zone plates is studied by the numerical calculation.It is generally considered that the distance between the object and the optics should meet the Fraunhofer diffraction using the spiral zone plate as the spatial filter.The numerical analysis shows that the spiral zone plate still works well in some Fresnel diffraction region.It means that the actual field of view is larger than that restricted by the Fraunhofer diffraction.The experimental results show good agreements with theoretical simulation.The method of fast Fourier transform can effectively evaluate the imaging performance of spiral zone plates and provide an important guide to the design of the spiral zone plate microscope.

关 键 词：傅里叶光学 螺旋型波带片 希尔伯特变换 边缘增强 空间滤波 

分 类 号：O436[机械工程—光学工程]