Linear and nonlinear intersubband optical absorption in double triangular quantum wells |
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| Authors: | Bin Chen Kang-Xian Guo Rui-Zhen Wang Zhi-Hai Zhang Zuo-Lian Liu |
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| Institution: | 1. Instituto de Física, Universidad de Antioquia, AA 1226, Medellín, Colombia;2. Facultad de Ciencias, Universidad Autónoma del Estado de Morelos, Ave. Universidad 1001, CP 62209, Cuernavaca, Morelos, México;3. Cumhuriyet University, Physics Department, 58140 Sivas, Turkey;4. Dokuz Eylül University, Physics Department, 35160 Buca, ?zmir, Turkey;1. Centre Régional des Métiers de l’Education et de Formation (CRMEF), Tanger, Morocco;2. Group of Optoelectronic of Semiconductors and Nanomaterials, ENSET, Mohammed V University in Rabat, Morocco;3. LCP-A2MC, Institut de Chimie, Physique et Matériaux, Université de Lorraine, Metz, France;4. Universidad EIA, CP 055428, Envigado, Colombia;5. Centro de Investigación en Ciencias-IICBA, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, CP 62209 Cuernavaca, Morelos, Mexico;6. Grupo de Materia Condensada-UdeA, Instituto de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia;1. Instituto de Física, Universidad de Antioquia, AA 1226 Medellín, Colombia;2. Facultad de Ciencias, Universidad Autónoma del Estado de Morelos, Ave, Universidad 1001, CP 62209 Cuernavaca, Morelos, Mexico |
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| Abstract: | The linear and the third-order nonlinear optical absorptions in the asymmetric double triangular quantum wells (DTQWs) are investigated theoretically. The dependence of the optical absorption on the right-well width of the DTQWs is studied, and the influence of the applied electric field on the optical absorption is also taken into account. The analytical expressions of the linear and the nonlinear optical absorption coefficients are obtained by using the compact density-matrix approach and the iterative method. The numerical calculations are presented for the typical GaAs/AlxGa1?xAs asymmetric DTQWs. The results show that the linear as well as the nonlinear optical absorption coefficients are not a monotonous function of the right-well width, but have complex relationships with it. Moreover, the calculated results also reveal that applying an electric field to the DTQWs with a thinner right-well can enhance the linear optical absorption but has no prominent influence on the nonlinear optical absorption. In addition, the total optical absorption is strongly dependent on the incident optical intensity. |
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