自成像局域空心光束产生的新方法及粒子俘获  

New method of generating self-imaged optical bottle beams and particles captured

作　　者：程治明[1] 吴逢铁[1] 张前安[1] 郑维涛[1] 

机构地区：[1]华侨大学信息科学与工程学院,泉州362021

出　　处：《物理学报》2012年第9期201-206,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:60977068;61178015);国家高功率激光物理重点实验室开放基金(批准号:SG-001102);华侨大学学科重点建设项目经费;泉州市科技重点项目(批准号:2011G9)资助的课题~~

摘　　要：本文提出了产生自成像局域空心光束(self-imaged bottle beams)的一种光学元件——液体轴棱锥.从衍射理论结合几何光学对经过轴棱锥后的光场进行了分析,得出注入液体折射率小于轴棱锥材料折射率时可产生自成像局域空心光束.并通过软件MathCAD模拟,得到一个完整周期光束的变换过程和局域空心光束的演变过程.研究发现液体轴棱锥产生的自成像局域空心光束具有周期及相干长度可调的特点.分析了如何利用自成像局域空心光束对粒子进行俘获,讨论了用自成像局域空心光束进行多层面粒子俘获的优势.We propose an novel optical element-liquid axicon-to generate self-imaged bottle beams in this paper. From the diffraction theory combined with geometrical optics the light field behind the liquid axicon is analyzed, and the result shows that when the refractive index of infused liquid is smaller than that of the axicon material, it can produce self-imaged optical bottle beams. Through simulation with software MathCAD, we obtain the conversion process of a complete self-imaged optical bottle beam cycle and the evolution process of the bottle beam. We find that the coherent length of self-imaged bottle beams generated by liquid axicon is adjustable. In this paper, we analyze how to use self-imaged bottle beams to capture the particles, and the advantages of capturing multilayer particles using self-imaged bottle beams are also discussed.

关 键 词：液体轴棱锥 局域空心光束 自成像 粒子俘获 

分 类 号：O436[机械工程—光学工程]