球形ZnS/CdSe/ZnS核壳壳量子点的三阶极化率参量相关特征  

Parametric Relative Properties of Third-order Nonlinear Optical Susceptibilities in a Zns/CdSe/ZnS Core-Shell-Shell Spherical Quantum Dot

作　　者：朱德权[1] 陈知红[2] 

机构地区：[1]安庆师范学院物理与电气工程学院,安徽安庆461000 [2]孝感学院物理与电子信息工程学院,湖北孝感432000

出　　处：《光子学报》2012年第5期586-590,共5页Acta Photonica Sinica

基　　金：国家自然科学基金(No.10772001)资助

摘　　要：在有效质量近似下,利用量子力学的密度矩阵理论,采用无限深势阱模型导出了三层球型量子点的三阶非线性光学极化率(自聚焦)的解析表达式.通过数值计算,分析了ZnS/CdSe/ZnS球型核壳结构量子点的三阶极化率(自聚焦)与量子点尺寸和入射光频率之间的关系.结果显示,量子点尺寸增大时,自聚焦效应三阶极化率(自聚焦)的峰值高度增大,峰值位置红移.本文的讨论为实验研究和实际应用提供了理论依据,对于光电器件的研究和改进有参考价值.Under the effective-mass approximation,the analytic expression for Self-focusing effect in ZnS/CdSe/ZnS core-shell-shell spherical quantum dots was derived by using the density matrix method.The numerical caculations were perforomed on the third-order susceptibilities as a function of the size of quantum dots and the frequency of the incident light were analyzed.The numerical results reveal that the third-order susceptibilities will increase with the increase of the quantum dot size,and position of the peak will red shifts.The conclusions provide a theoretical basis for experimental research and practical applications,and for research and improvement of photoelectric device with references.

关 键 词：量子点 三阶极化率 非线性光学 

分 类 号：O436.4[机械工程—光学工程]