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.
出处
《光子学报》
EI
CAS
CSCD
北大核心
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
关键词
量子点
三阶极化率
非线性光学
Quantum dot
Third-order susceptibilities
Nonlinear optical
