二维各向异性随机介质内光波模式的特性研究

Optical characteristics of light waves in two-dimensional random media with uniaxial scatterers

通过建立能够描述各向异性介电常数变化情况的二维随机介质模型,利用时域有限差分法联立求解随机介质中光波所满足的Maxwell方程和激光速率方程,研究了各向异性散射增益材料中的随机激光辐射现象。结果表明随机介质中各向异性散射颗粒的无序程度由空间位置无序和空间方向无序共同决定,空间方向的无序能够加强随机激射的辐射。同时存在两种无序机制的随机介质,在相同条件下它的随机辐射行为要强于仪存在一种无序机制的随机介质。

A new model was built for light propagation in two-dimensional anisotropic random medium, and the dielectric constant distribution was precisely described. The optical property of light waves in two- dimensional random media with uniaxial scattering particles was investigated by simultaneously solving Maxwell＇s equations and rate equations of electronic population. Results show that ordered scatterers in anisotropic material can also form localization of light-waves if the index of refraction of the uniaxial scatterers distribute randomly in two-dimensional media. The randomness of roiation angle of the optic axis determines the index of refraction of each scattering particle and reinforces the random lasing in random media.