消逝场增益耦合微型球腔的光散射理论研究  

The calculation of gain coupling of evanescent field in spherical micro-cavity with the method of light scattering

作　　者：王亚丽[1] 陈天江[1] 普小云[1] 

机构地区：[1]云南大学物理系

出　　处：《云南大学学报（自然科学版）》2005年第6期504-508,共5页Journal of Yunnan University(Natural Sciences Edition)

基　　金：国家自然科学基金资助项目(10174060;10564005);云南省自然科学基金资助项目(2003A0009R)

摘　　要：采用米氏光散射理论,计算了微型球腔中口哨廊模(WGMs)的场强分布.对球腔浸入不同折射率的液体介质后的场强分布,WGMs的消逝场模体积占总场模体积的比值(η值),WGMs的品质因素(Q值)等重要参数做了计算和分析.结果表明:随着球腔和环境介质相对折射率的减小,WGMs的Q值变低,η值增加.较高的η值,增加了消逝波增益耦合的耦合效率,有利于微型球腔中消逝波增益耦合的受激辐射放大过程.Base on the theory of Mie light scattering, the intensity distribution of Whispering gallery modes （WGMs） in a spherical cavity is calculated. After inserting a spherical cavity into various liquid mediurns, the ratios of evanescent field to the whole mode field （η） and the quality factor（Q） of WGMs are calculated. With a decrease of relative refraction index, the calculated results show that the Q value of a WGM is degraded, however, ηvalue is increased. A high ηvalue means a high coupling efficiency, which is benefit to the stimulated emission amplification of evanescent field coupled gain.

关 键 词：口哨廊模 消逝场 模体积比 品质因素 

分 类 号：O436.2[机械工程—光学工程]