Propagation properties and radiation force of circular Airy Gaussian vortex beams in strongly nonlocal nonlinear medium  

作　　者：Xinyu Liu Chao Sun Dongmei Deng 刘欣宇;孙超;邓冬梅(Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices,South China Normal University,Guangzhou 510631,China)

机构地区：[1]Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices,South China Normal University,Guangzhou 510631,China

出　　处：《Chinese Physics B》2021年第2期285-292,共8页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11374108 and 11775083)。

摘　　要：We study the abruptly autofocusing and autodefocusing properties of the circular Airy Gaussian vortex(CAi GV)beams in strongly nonlocal nonlinear medium for the first time through numerical simulations.The magnitude of topological charges and the position of the vortex could change not only the light spot pattern but also the intensity contrast.Meanwhile,we can change the position of the autofocusing and autodefocusing planes by changing the parameter of the incident beam.Furthermore,we can control the peak intensity contrast through choosing properly the truncation factor.As for the radiation force,we study the gradient and the scattering forces of CAi GV beams on Rayleigh dielectric sphere.Our analyses demonstrate that the radiation force can be enhanced by choosing proper parameters of CAi GV beams.

关 键 词：optical vortices abruptly autofocusing radiation force strongly nonlocal nonlinear 

分 类 号：O437[机械工程—光学工程]