低频强场作用下三维光子晶体中二能级原子的自发辐射性质  

Spontaneous emission properties of a two-levelatom with an intense low-frequency fieldin a three-dimensional photonic crystal

作　　者：谭荣[1] 李高翔[1] 

机构地区：[1]华中师范大学物理科学与技术学院,武汉430079

出　　处：《物理学报》2005年第5期2059-2065,共7页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :10 2 0 40 0 9);教育部优秀青年教师计划资助的课题 .~~

摘　　要：研究了处于三维光子晶体中 ,且在强相干的低频场的驱动下的单个二能级原子的自发辐射性质 .由于低频场的影响 ,使得原子产生了在跃迁过程中吸收或发射一个低频光子的衰减渠道 .这些跃迁导致了自发辐射的量子干涉 ,再加上光子晶体能带带边的作用 ,自发辐射被显著抑制 .原子的布居俘获依赖于原子上能级与能带带边的相对位置 ,低频场的频率和原子不同跃迁通道间的相对跃迁强度 .We have investigated spontaneous emissions from a two-level atom embedded in a photonic crystal with three-dimensional dispersion relation as well as interacted with a coherent intense low-frequency field. Due to this field, additional decay channels with exchange of one low-frequency photon during an atomic transition are created, resulting in the spontaneously induced quantum interference. The spontaneous emission can be suppressed significantly because of the combinational influences of the quantum interference effect and the band edge effect. The population in the upper levels depends on the relative position of the upper level from the band edge. The frequency of the low-frequency field and the relative intensity of the coupling strength for the transitions can affect spontaneous emission from the atom.

关 键 词：光子晶体 二能级原子 自发辐射 原子跃迁 量子干涉 

分 类 号：O562[理学—原子与分子物理]