随机介质的相干背散射与局域化研究  

Coherent Backscattering and Localization in Random Media

作　　者：李欣[1] 杨明[1] 孙宇超[2] 郭士亮[2] 李志全[2] 

机构地区：[1]哈尔滨工业大学控制与仿真中心,黑龙江哈尔滨150080 [2]燕山大学电气工程学院,河北秦皇岛066004

出　　处：《发光学报》2013年第1期87-91,共5页Chinese Journal of Luminescence

基　　金：国家自然科学基金(61172044);河北省自然科学基金(F2010002002)资助项目

摘　　要：研究了不同尺度参数和粒子浓度下的ZnO随机介质相干背散射强度的分布规律,采用时域有限差分法分析了不同浓度随机介质的光场能量空间分布,预测了随机激光器阈值的高低。结果表明:同一折射率的介质随着介质尺寸的增大,相干背散射的带宽变窄,局域化参量kl值相应增大,使得局域化程度呈较大幅度减弱趋势;并且随着介质浓度的增加,相干背散射的带宽变宽,局域化程度增强,阈值降低。相干背散射有着光子局域化的先期特征,现在已成为研究光子局域化出现与否的基本判断依据,对研究光子局域化以及随机激光器具有重要意义。In order to measure and research the localization of random media,coherent backscattering（CBS） from ZnO random media is investigated and spatial distribution of electric field of random particles with different concentration is obtained.We studied the distribution of coherent backscattering intensity with different size parameters and different thickness of random media.The results show that under the condition of identical refractive index,the bandwidth of coherent backscattering becomes narrower with the increase of size parameters and the decrease of the concentration.In addition,kl parameter is amplified leading to the localization level is relatively decreased.Further investigation of these issues is significant in decision of localization of light and new energy.

关 键 词：随机介质 相干背散射 局域化 

分 类 号：O436[机械工程—光学工程]