二维非球形粒子随机介质中光场的传输特性  

Transmission Characteristics of Optical Field in 2D Random Medium of Non-Spherical Particles

作　　者：李志全[1] 郑莎[1] 牛力勇[1] 李文超[2] 孙宇超[1] 

机构地区：[1]燕山大学电气工程学院,河北秦皇岛066004 [2]东北大学秦皇岛分校自动化系,河北秦皇岛066004

出　　处：《中国激光》2012年第3期34-38,共5页Chinese Journal of Lasers

基　　金：国家自然科学基金(60877047);河北省自然科学基金(F20100002002)资助课题

摘　　要：研究了散射粒子形状改变对光波在二维随机介质系统中的传输情况的影响。基于整体散射效应模型,建立了非球形粒子作为散射粒子的二维随机介质的模型。构建了模型的Maxwell方程,采用非均匀网格划分的时域有限差分(FDTD)方法解Maxwell方程,得到了TM模在非球形粒子二维随机介质模型中的传输及空间分布。采用快速傅里叶变换(FFT)对仿真获得的数据进行频谱变换,得到光波在频域上的发射谱。与以往的研究相比较,仿真结果表明,在非球形粒子系统中,光波的电场强度与球形粒子系统中电场强度随着散射粒子浓度的增加而增加不同,而是出现振荡的现象;发射谱显示,非球形粒子系统的模式竞争强于球形粒子系统,更易于实现模式选择。Transmission characteristics of optical field in 2D random medium of non-spherical particles are studied.Based on the overall scattering effect,a two-dimensional random media model of non-spherical particles as scattering particle is established.The Maxwell equations for the model are built.Using non-uniform mesh finite different time domain（FDTD） method to solve Maxwell′s equations,the transmission and spatial distribution of TM mode in the two-dimensional random medium model of non-spherical particles has been achieved.Using the data obtained from simulation,light emission spectrum in frequency domain is calculated by fast Fourier transform（FFT）.Compared with previous studies,the results show that in the non-spherical particle systems,the light intensity is different from the intensity in spherical particle systems which increases with the concentration of scattering particles increasing,and it is of oscillation.The emission spectrum shows mode competitions in non-spherical particles systems are stronger than the spherical particle systems.They are easier to realize mode selection.

关 键 词：激光物理 随机介质 散射粒子形状 时域有限差分法 局域化 

分 类 号：O436[机械工程—光学工程]