闭合轨道理论在二层介质中原子自发辐射问题上的应用  

The Applications of the Closed Orbit theory to the Spontaneous Emission of Atoms in a Dielectric Slab

作　　者：靳延平[1] 杜孟利[2] 顾本源 王雪华[3] 周云松[1] 王福合[1] 

机构地区：[1]首都师范大学,北京100037 [2]中国科学院理论物理所,北京100080 [3]中科院物理所,北京100080

出　　处：《首都师范大学学报（自然科学版）》2005年第4期28-31,共4页Journal of Capital Normal University：Natural Science Edition

摘　　要：利用量子电动力学计算了二层介质中电磁场零点涨落,并用原子物理中发展成熟的闭合轨道理论探讨了原子自发辐射速率随发光原子离开界面的距离的增加而变化的特性.研究结果表明:当发光原子远离界面时,原子自发辐射速率呈现衰减的周期振荡现象.通过傅立叶变换,得到了原子自发辐射速率随发光原子离开界面的距离的增加而振荡的频率,为了解释这些现象,我们首次将闭合轨道理论应用于研究两层介质中原子的自发辐射,给出了一种对原子自发辐射现象新的理解方式.We apply quantum electrodynamics to calculate the zero-point fluctuations of the electromagnetic field in a two-layer dielectric material and discuss the variations of the spontaneous emission rate of an atom. The calculated results show that hte spontaneous emission rate displays a periodical oscillation when the distance between the atom and the interface is increased. The frequencies of oscillations are obtained by Fourier transform. In order to explain the behavior of oscillations, we apply the theory of closed orbits to study the spontaneous emissioff in the dielectric materials for the first time, and give a new understanding of the behavior of the spontaneous emission.

关 键 词：自发辐射 闭合轨道 电磁场零点涨落 傅立叶变换 

分 类 号：O43[机械工程—光学工程]