基于非对称量子阱的太赫兹波调制器

THz wave modulator based on non-symmetric quantum well

主要研究了一个特殊的GaAs/AlGaAs非对称量子阱中的线性和三阶非线性太赫兹波吸收系数和介质折射率的相对改变。首先利用量子力学中的密度矩阵算符理论和迭代方法导出了线性和三阶非线性光吸收系数和相对折射率改变的表达式,然后以典型的阶梯型量子阱材料为例做了数值计算。计算表明,基于泵浦光场和偏置电压控制的太赫兹波调制器不仅可以做太赫兹波开关,还可以灵活地调制太赫兹波信号的强度和相位,方便实用。

By using the density matrix approach and numerical calculation methods,the linear and nonlinear intersubband refractive index changes and the linear and nonlinear intersubband THz wave absorption in a special GaAs/AlGaAs quantum well were investigated,the numerical results reveal that the THz wave modulator controled by pump optical intensity and electric field can not only function as a THz wave switch but also can modulate THz wave intensity and phase conveniently.