J4 ›› 2013, Vol. 30 ›› Issue (3): 330-334.

• 非线性光学 • 上一篇    下一篇

正切平方势阱中光学吸收系数的研究

李斌,陈国杰   

  1. 佛山科学技术学院光电子与物理学系,广州 佛山,528000
  • 收稿日期:2012-07-23 修回日期:2012-11-29 出版日期:2013-05-28 发布日期:2013-05-06
  • 通讯作者: 李斌(1973-),女,湖南益阳人,硕士,主要研究方向为量子光学、非线性光学等。 E-mail:lbfosu@sohu.com

Intersubband optical absorption in square tangent quantum well

LI Bin, CHEN Guo-jie   

  1. Department of Photoelectron and Physics , Foshan University, Foshan 528000, China
  • Received:2012-07-23 Revised:2012-11-29 Published:2013-05-28 Online:2013-05-06
  • Supported by:
    Supported by the National Natural Science Foundation of China (61178030)

摘要: 在量子力学框架内,利用正切平方势把电子的Schrodinger方程化为了超几何方程,并用超几何函数严格求解了电子的本征值和本征函数。利用量子力学中的密度矩阵算符理论导出了正切平方势阱中的线性与三阶非线性光学吸收系数的解析表达式。计算了该系统中的线性与非线性光学吸收系数的大小,讨论了影响吸收系数变化的因素。文章以典型的AlGaAs/GaAs 势阱为例作了数值计算,数值计算结果表明,势阱的形状和入射光强对光学吸收系数的变化有着重要的影响。

关键词: 非线性光学, 正切平方势阱, 吸收系数, 密度矩阵近似

Abstract: The linear and nonlinear optical absorptions in square tangent quantum well are studied. Analytic forms of the linear and third-order nonlinear optical absorption coefficients are derived using the compact density matrix approach method. Based on this model, the numerical results are presented for a typical AlGaAs/GaAs square tangent quantum well. The calculated results show the shape of the quantum well and the incident optical intensity have great influence on the optical absorption coefficients in square tangent quantum well.

Key words: nonlinear optics, square tangent quantum well, optical absorption, density matrix approach

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