半抛物量子阱中的线性与非线性光学吸收系数

Linear and Nonlinear Optical Absorptions in Semiparabolic Quantum Wells

摘要:

采用密度矩阵与迭代处理的方法,给出了计算施加电场的半抛物量子阱(QWs)系统中的线性与非线性光学吸收系数的详细过程.并且推导了此系统中的简单解析的线性与非线性光学吸收系数.对GaAs材料构成的QWs进行了数值计算.结果显示,系统中的线性与非线性光学吸收系数敏感地依赖于外加的电场强度、QWs的受限势频率以及入射光的强度.

Abstract:

By using the compact density matrix approach and iterative procedure,a detailed procedure for the calculation of the linear and nonlinear optical absorption coefficients was given in the electric-field-biased semi parabolic quantum wells(QWs).The simple analytical formulas for the linear and nonlinear optical absorption coefficients in the systems are also deduced.Numerical result on typical GaAs materials shows that,the linear and nonlinear optical absorption coefficients sensitively depend on the applied electric field and the confined potential frequency of the semiparabolic QWs systems as well as the incident optics beam intensity.