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题名: Linear and nonlinear intersubband optical properties in a step quantum well with an applied electric field
作者: Chang K;  Wu WG;  Jiang DS;  Xia JB
发表日期: 1998
摘要: Within the framework of the effective-mass envelope-function theory, the field-dependent intersubband optical properties of a Al0.4Ga0.6As/Al0.2Ga0.8As/GaAs step quantum well are investigated theoretically based on the periodic boundary condition. A very large Stark shift occurs when the lowest subband electron remains confined to the small well while the higher subband electron confined to the big well. The optical nonlinearity in a step well due to resonant intersubband transition (ISBT) is analyzed using a density-matrix approach. The second-harmonic generation coefficient chi(2 omega)((2)) and nonlinear optical rectification chi(0)((2)) have also been investigated theoretically. The results show that the ISBT in a step well can generate very large second order optical nonlinearities, chi(0)((2)) and chi(2 omega)((2)) can be tuned by the electric field over a wide range.
KOS主题词: Example;  Modeling
刊名: ACTA PHYSICA SINICA-OVERSEAS EDITION
专题: 中国科学院半导体研究所(2009年前)_期刊论文

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Chang K; Wu WG; Jiang DS; Xia JB .Linear and nonlinear intersubband optical properties in a step quantum well with an applied electric field ,ACTA PHYSICA SINICA-OVERSEAS EDITION,1998,7(5):368-378
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