幂指数相位涡旋光束用于微粒操控  

Power-Exponent-Phase Vortices for Manipulating Particles

作　　者：罗伟[1] 程书博[1] 袁战忠 陶少华[1,2] 

机构地区：[1]中南大学物理与电子学院,湖南长沙410083 [2]中南大学超微结构与超快过程湖南省重点实验室,湖南长沙410083

出　　处：《光学学报》2014年第11期93-97,共5页Acta Optica Sinica

基　　金：国家自然科学基金(61178017);湖南省自然科学基金重点项目(11JJ2039)

摘　　要：实验验证了一种利用幂指数相位涡旋光束(PEPV)操控微粒的方法。该方法基于幂指数相位涡旋光束理论,产生不同拓扑荷数与方位角幂指数大于1的涡旋光场的相位全息图,并将该全息片经计算机输入到空间光调制器(SLM)上用于调制入射激光光束。利用透镜对被调制光束进行傅里叶变换,利用光阑在频域对衍射光斑进行筛选和过滤,并利用倒置高倍光学显微镜将光束成像于载物台样品上。利用该幂指数相位涡旋光束对微米级粒子实现了定向光学输运。研究结果表明,该光束在粒子的定向输送与收集方面有独特的功能,将进一步拓展光学涡旋光束的实际应用范围。An approach of manipulating micro-particles based on the theory of power-exponent-phase vortices （PEPV） is demonstrated experimentally. Phase holograms are generated to produce PEPVs with different topological charges and exponential powers. The holograms are displayed sequentially on a spatial light modulator （SLM） for modulating the incident laser beam. The modulated light beam is Fourier transformed by a lens, and then filtered by a pinhole. The selected diffraction order of the beam is focused on the sample stage of an inverted optical microscope. The experimental results verify that the PEPV beam can be used to optically transport micron-sized particles directionally. The beam is found to possess a unique function in the transportation and collection of micro-particles, and can have extensive practical applications in many fields.

关 键 词：光学设计 光学涡旋 衍射 空间光调制器 全息光镊 

分 类 号：O438[机械工程—光学工程] O439[理学—光学]