基于涡旋光照明的暗场数字全息显微方法研究  

Dark-field digital holographic microscopy by using vortex beam illumination

作　　者：赵应春 张秀英[1] 袁操今[1] 聂守平[1] 朱竹青[1] 王林[1] 李杨[1] 贡丽萍 冯少彤[1] 

机构地区：[1]南京师范大学,江苏省光电技术重点实验室,南京210023

出　　处：《物理学报》2014年第22期174-179,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61377003;61275133);南京师范大学高层次人才科研启动项目(批准号:184080H20162);南京师范大学青年领军人才培养项目(批准号:184080H20178)资助的课题~~

摘　　要：提出了一种基于涡旋光照明的暗场数字全息显微方法.从理论上阐述了涡旋光环形照明原理和暗场数字全息显微原理,分析了涡旋光的准无衍射特性对成像的影响;搭建了相应的数字全息显微成像系统,采用690 nm的聚苯乙烯小球作为实验样品;最后通过对小球明暗场下数字全息显微再现像的分析对比,证明该方法可以有效地提高数字全息系统的分辨率,同时增强了再现像的对比度.We propose a dark-field digital holographic microscopy （DHM） by using vortex beam illumination. In this paper, the annular illumination of vortex beam and the dark-field DHM imaging system are theoretically analyzed, and the quasi-nondiffracting property of the vortex beam is discussed. A corresponding DHM imaging system is established. The polystyrene spheres each with a size of 690 nm are utilized as objects in the experiment. By comparing the results of reconstructed images under bright-field illumination with those under dark-field illumination DHM, it is proved that the resolution of dark-field DHM under speckle-field illumination is improved and the contrast of its reconstructed image is enhanced accordingly.

关 键 词：全息 暗场数字全息显微 涡旋光 分辨率 

分 类 号：O438.1[机械工程—光学工程]