核壳结构CdSe/ZnS量子点量子阱中1se1sh激子光跃迁的受激光子回波研究  

Investigation on Stimulated Photon Echo Induced by Optical Transition of 1s_e1s_h Excitons in Core-shell CdSe/ZnS Quantum Dot-quantum Well

作　　者：龚少华[1,2] 傅军[1] 符运良[1] 沈振江[1] 

机构地区：[1]海南师范大学物理与电子工程学院,海口571158 [2]中国科学院空间大气国家重点实验室,北京100000

出　　处：《光子学报》2012年第1期54-60,共7页Acta Photonica Sinica

基　　金：海南省自然科学基金(No.110006,No.511115);海南师范大学光学重点学科建设项目(No.HS-2-2011-070207);中国博士后自然科学基金(No.20110490609)资助

摘　　要：在建模和理论分析的基础上,对三脉冲飞秒激光作用下核壳结构CdSe/ZnS量子点量子阱中1se1sh激子光跃迁引起的受激光子回波效应进行了深入研究.运用有效质量近似方法求解了载流子的静态薛定谔方程,得到能量本征值和对应波函数.基于光学Bloch方程,分析了受激光子回波的参量相关性.结果显示受激光子回波信号可以通过量子点量子阱结构和尺寸的改变进行有效调节.同时,在量子尺寸限制理论的基础上讨论了结构和尺寸的变化对受激光子回波信号的具体影响.Excited with three femtosecond laser pulses,the stimulated photon echo phenomenon is studied,which is induced by the optical transition of 1se1sh excitons in a core-shell CdSe/ZnS quantum dot-quantum well.The energy eigenvalues and eigenfunctions of charge carriers were obtained by solving the stationary Schrdinger equation under the effective-mass approximation.The parameter dependence of the photon echo signals was investigated employing the optical Bloch equations.The numerical results reveal that the stimulated photon echo phenomenon can be effectively controlled by the variation of the size and structure of quantum dot-quantum well.And the corresponding mechanism was discussed in terms of the quantum size confined effect theory.

关 键 词：受激光子回波 核壳结构量子点量子阱 光学Bloch方程 

分 类 号：O439[机械工程—光学工程] 4265G[理学—光学]