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首页> 外文期刊>Physica, B. Condensed Matter >Intersubband optical absorption coefficients and refractive index changes in a graded quantum well under intense laser field: Effects of hydrostatic pressure, temperature and electric field
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Intersubband optical absorption coefficients and refractive index changes in a graded quantum well under intense laser field: Effects of hydrostatic pressure, temperature and electric field

机译：在强激光场下渐变量子阱中的子带间光吸收系数和折射率变化：静水压力，温度和电场的影响

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摘要

The effects of hydrostatic pressure, temperature, and electric field on the optical absorption coefficients and refractive index changes associated with intersubband transition in a typical GaAs/Ga_(0.7)Al_(0.3)As graded quantum well under intense laser field have been investigated theoretically. The electron energy eigenvalues and the corresponding eigenfunctions of the graded quantum well are calculated within the effective mass approximation and envelope wave function approach. The analytical expressions of the optical properties are obtained using the compact density-matrix approach and the iterative method. The numerical results show that the linear and nonlinear optical properties depend strongly on the intense laser field and electric field but weakly on the hydrostatic pressure and temperature. Additionally, it has been found that the electronic and optical properties in a GaAs/Ga_(0.7)Al_(0.3)As graded quantum well under the intense laser field can be tuned by changing these external inputs. Thus, these results give a new degree of freedom in the devices applications.
机译：从理论上研究了在强激光场下，典型的GaAs / Ga_（0.7）Al_（0.3）As梯度量子阱中静水压力，温度和电场对与子带间跃迁相关的光吸收系数和折射率变化的影响。在有效质量近似和包络波函数方法下，计算了梯度量子阱的电子能量本征值和相应的本征函数。使用紧密密度矩阵法和迭代法获得了光学性质的解析表达式。数值结果表明，线性和非线性光学特性主要取决于强激光场和电场，而与静液压和温度无关。另外，已经发现，可以通过改变这些外部输入来调整在强激光场下的GaAs / Ga_（0.7）Al_（0.3）As梯度量子阱中的电子和光学性质。因此，这些结果为设备应用提供了新的自由度。

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