水下悬浮球形藻类粒子群对拉盖尔-高斯涡旋光束的散射  

Scattering of Laguerre-Gaussian Vortex Beams by Underwater Suspended Spherical Algal Particle Swarms

作　　者：王明军[1,2,3] 张佳琳 王主玉 张华永 Wang Mingjun;Zhang Jialin;Wang Zhuyu;Zhang Huayong(School of Automation and Information Engineering,Xi′an University of Technology,Xi′an 710048,Shaanxi,China;School of Physics and Telecommunications Engineering,Shaanxi University of Technology,Hanzhong 723001,Shaanxi,China;Shaanxi Civil-Military Integration Key Laboratory of Intelligence Collaborative Networks,Xi′an 710126,Shaanxi,China;School of Electronic and Information Engineering,Anhui University,Hefei 230039,Anhui,China)

机构地区：[1]西安理工大学自动化与信息工程学院,陕西西安710048 [2]陕西理工大学物理与电信工程学院,陕西汉中723001 [3]陕西省智能协同网络军民共建重点实验室,陕西西安710126 [4]安徽大学电子信息工程学院,安徽合肥230039

出　　处：《光学学报》2022年第18期191-198,共8页Acta Optica Sinica

基　　金：国家自然科学基金重大研究计划培育项目(92052106);国家自然科学基金(61771385);陕西省杰出青年科学基金(2020JC-42);固体激光技术重点实验室开放基金(6142404190301);西安市高校人才服务企业工程项目(GXYD14.26)。

摘　　要：水下信道中存在大量的悬浮藻类粒子,对激光信号传输特性有显著的影响。基于广义Mie理论,建立了水下悬浮球形藻类粒子对拉盖尔-高斯(LG)涡旋光束的散射模型。首先,数值仿真了单个悬浮球形藻类粒子对LG涡旋光束散射特性的影响,并计算了粒子半径、束腰半径、涡旋光阶数和拓扑荷数对其微分散射截面的影响。然后,进一步讨论了水下悬浮球形藻类粒子群对LG涡旋光束微分散射截面的影响。结果表明:对于水下单个悬浮球形藻类粒子,微分散射截面随粒子半径、涡旋光阶数和束腰半径的增大而增大,随涡旋光拓扑荷数的增大而减小;对于水下悬浮球形藻类粒子群,微分散射截面随涡旋光阶数和束腰半径的增大而增大,随涡旋光拓扑荷数的增大而减小。A large number of suspended algal particles exist in the underwater channels,which has a significant impact on the transmission characteristics of laser signals.Therefore,by the generalized Mie theory,a model for the scattering of Laguerre-Gaussian(LG)vortex beams by underwater suspended spherical algal particles is built.Specifically,numerical simulations of the effect of a single suspended spherical algal particle on the scattering characteristics of LG vortex beams are conducted,and the influence of the particle radius,beam waist radius,vortex beam order and topological charge on the differential scattering cross sections of LG vortex beams is calculated.Then,the influence of the underwater suspended spherical algal particle swarms on the differential scattering cross sections of LG vortex beams is further discussed.The results indicate that in the case of a single underwater suspended spherical algal particle,the differential scattering cross section increases with the increase in the particle radius,vortex beam order and beam waist radius,and decreases with the increase in the topological charge of vortex beams.Regarding the underwater suspended spherical algal particle swarm,the differential scattering cross section increases with the increase in the vortex beam order and beam waist radius,and decreases with the increase in the topological charge of vortex beams.

关 键 词：散射 广义Mie理论 拉盖尔-高斯涡旋光束 微分散射截面 藻类粒子群 

分 类 号：O436.2[机械工程—光学工程]