花瓣型波带片的紧聚焦光斑形貌操控  

Manipulation on the tight focusing spot of the Petal-Zone plate

作　　者：黄珍献[1] 梁七奇 贾光一[1] 马巧云[1] 刘敏 曹彦鹏[1] HUANG Zhen-xian;LIANG Qi-qi;JIA Guang-yi;MA Qiao-yun;LIU Min;CAO Yan-peng(Department of Physics,School of Science,Tianjin University of Commerce,Tianjin 300134,China)

机构地区：[1]天津商业大学理学院应用物理系,天津300134

出　　处：《光电子．激光》2020年第1期39-45,共7页Journal of Optoelectronics·Laser

基　　金：天津商业大学青年基金(160111);2019年天津市大学生创新创业训练计划项目(201910069101)资助项目。

摘　　要：紧聚焦条件下的光场调控技术,在激光加工、光学微操控和光学超分辨显微等领域有着重要的应用价值。本文基于德拜-沃尔夫衍射理论的三维傅里叶变换形式,给出了一种设计花瓣型波带片的公式。花瓣形光斑的中心透过率公式与花瓣的频率,径向位移参数以及高数值孔径轴向移动距离有关。通过此公式可以设计不同参数的花瓣型二元相位波带片。本文研究了花瓣型波带片在紧聚焦场下的光场分布。通过数值模拟研究发现,当花瓣频率数确定时,改变轴向位移参数和径向位移参数,可以调控聚焦光斑的轴向移动位置。同时,还发现当径向位移和轴向位移不变时,花瓣频率的变化导致产生了特殊形貌的光斑和超衍射极限的多焦点光斑。这些聚焦光斑有望在超分辨衍射成像、粒子操控方面具有一定的应用价值。The control technique of optical field under the tight focusing conditions has great application in the fields of laser processing,optical micro-nano manipulating,optical super resolution imaging and so forth.This paper gives a formula for designing the Petal zone plate based on the three dimensional Fourier transform of Debye-Wolf vector diffraction theory.The central transmittance formula of petal-shaped spot is related to petal frequency,radial shifting parameter and axial shifting of high aperture.The petal-shaped binary phase zone plate with different parameters can be designed by using this formula.In the present work,the optical field distribution of the Petal zone plate under the tight focusing field is studied in detail.According to the numerical simulation results,it is found that the axial shifting of the focus spot can be modulated by changing the axial shifting parameter and radial shifting parameter when the Petal frequency is determined.Meanwhile,it is also found that when the radial shifting and the axial shifting keep unchanged,the variation of petal frequency gives rise to the appearance of special morphological light spots and multi-focus light spots beyond the diffraction limit.These focused spots are expected to have certain application value in super-resolution diffraction imaging and particle manipulation.

关 键 词：紧聚焦 花瓣频率 径向位移 波带片 

分 类 号：O436[机械工程—光学工程]