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

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.