Shaping of focal field with controllable amplitude, phase, and polarization  

作　　者：郝晶晶 于忠良 陈召忠 陈浩 丁剑平 

机构地区：[1]National Laboratory of Solid State Microstructures and School of Physics,Nanjing University

出　　处：《Chinese Optics Letters》2014年第9期1-5,共5页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China under Grant Nos.11074116 and 11274158

摘　　要：We propose a method for configuring the distribution of amplitude, phase, and polarization in the focal region of vector beams. The polarization and phase of incident beam is spatially tailored so that it can produce a focal field that has elaborately prescribed shapes. Our work focuses on the design of a special focus structure with two oval rings, wherein a phase gradient and polarization gradient exist in the inner and outer rings, respectively. The incident light yielding the desired focal field is determined based on an iterative scheme involving vectorial diffraction calculations and fast Fourier transforms. Simulations and experiments demonstrate the generation of a focal field with phase and polarization gradients, which may find applications in optical manipulation.We propose a method for configuring the distribution of amplitude, phase, and polarization in the focal region of vector beams. The polarization and phase of incident beam is spatially tailored so that it can produce a focal field that has elaborately prescribed shapes. Our work focuses on the design of a special focus structure with two oval rings, wherein a phase gradient and polarization gradient exist in the inner and outer rings, respectively. The incident light yielding the desired focal field is determined based on an iterative scheme involving vectorial diffraction calculations and fast Fourier transforms. Simulations and experiments demonstrate the generation of a focal field with phase and polarization gradients, which may find applications in optical manipulation.

关 键 词：Iterative methods POLARIZATION 

分 类 号：O436.3[机械工程—光学工程]