| 柱形量子点中的三阶极化率 |
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| 引用本文： | 刘翠红. 柱形量子点中的三阶极化率[J]. 光子学报, 2005, 34(11): 1740-1744 |
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| 作者姓名： | 刘翠红 |
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| 作者单位： | 华南师范大学激光生命科学研究所,广州,510631;广州大学,物理与电子工程学院电子信息系,广州,510006 |
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| 基金项目： | 广东省自然科学基金（编号：05001873）,广州市高校科技计划项目（编号：2028）. |
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| 摘 要： | 利用量子力学的密度矩阵理论,在有效质量近似下，采用有限深势阱模型，导出了柱形量子点的三阶非线性极化率的解析表达式.通过数值计算，分析了GaAs/AlβGa1－βAs柱形量子点的三阶非线性极化率与量子点尺寸、掺杂浓度、入射光的频率和偏振方向等参量的关系.结果表明，三阶极化率峰值位置与这些参量密切相关，并且对于确定频率和偏振方向的入射光以及材料的掺杂浓度，存在与之相匹配的量子点尺寸，使三阶极化率达到极大，比体材料的相应值高出2个数量级以上.
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| 关 键 词： | 量子点 密度矩阵理论 三阶极化率 非线性光学 |
| 收稿时间： | 2004-07-20 |
| 修稿时间： | 2004-07-20 |
Third-order Nonlinear Optical Susceotibility in a Cylindrical Quantum Dot |
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| Liu Cuihong. Third-order Nonlinear Optical Susceotibility in a Cylindrical Quantum Dot[J]. Acta Photonica Sinica, 2005, 34(11): 1740-1744 |
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| Authors: | Liu Cuihong |
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| Affiliation: | 1.Institute of Laser Life Science, South China Normal University, Guangzhou 510631; 2. Guangzhou University, School of Physics and Electronic Engineering, Guangzhou 510405 |
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| Abstract: | Under the effective mass approximation, the analytic expression for the third-harmonic generation (THG) in cylindrical quantum dots was derived by using the density matrix method. The numerical calculations were performed on a cylindrical GaAs/Al_βGa_ 1-βAs quantum dot with different incident photon energy, polarizations, and under various dot dimensions and Al concentrations. It is found that the THG is more than two orders of magnitude larger than that of bulk GaAs under appropriate conditions. |
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| Keywords: | Quantum dot Density matrix method Third-harmonic generation Nonlinear optical |
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