实验产生超分辨光学聚焦暗斑  

Experimental generation of a superresolution optical dark focused spot

作　　者：姜利平[1] 刘玲玲[1] 朱厚飞 王海凤[1] 

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《光学仪器》2016年第1期31-34,40,共5页Optical Instruments

基　　金：973基金资助项目(2015CB352001)

摘　　要：用二元相位器件调制角向偏振激光光束,然后用高数值孔径物镜聚焦,在实验上产生了一个超分辨光学聚焦暗斑。二元相位器件的调制作用是通过让角向偏振光束经一块刻有多环同心环状凹槽的玻璃基板实现的。用刀口法检测了焦点附近的3D光束分布特性,得到了尺寸是0.32λ且在4λ左右的长度内保持不变的超分辨暗斑。这样的光学聚焦暗斑可能会应用于超分辨显微技术和光学捕获。We generate a superresolution optical dark focused spot by tightly focusing a binary phase modulated azimuthally polarized laser beam.The binary phase modulation is realized by letting the azimuthally polarized light pass through a glass substrate with multi-belt concentric ring grooves.We also characterize the 3Dbeam profile by using knife-edge method.The size of the superresolution dark spot is found to be 0.32λ,which remains unchanged for^4λwithin the tube.Thus optical spot may find applications in superresolution microscopy and optical trapping.

关 键 词：光学设计及制作 二元光学器件 光电探测器 偏振态 

分 类 号：O432[机械工程—光学工程]