Intersubband absorption with difference-frequency generation in GaAs asymmetric quantum wells
Cao Xiao-Long (曹小龙)a c, Li Zhong-Yang (李忠洋)b, Yao Jian-Quan (姚建铨)a c, Wang Yu-Ye (王与烨)a c, Zhu Neng-Nian (朱能念)a c, Zhong Kai (钟凯)a b, Xu De-Gang (徐德刚 )a b
a College of Precision Instrument and Opto-electronics Engineering, Institute of Laser and Opto-electronics, Tianjin University, Tianjin 300072, China; b Institute of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou 450011, China; c Key Laboratory of Opto-electronics Information Technology (Tianjin University), Ministry of Education, Tianjin 300072, China
Abstract An asymmetric quantum well (AQW) is designed to emit terahertz (THz) waves by using difference frequency generation (DFG) with the structure of GaAs/Al0.2Ga0.8As/Al0.5Ga0.5As. The characteristics of absorption coefficients are analysed under the parabolic and non-parabolic energy-band conditions in detail. We find that the absorption coefficients vary with the two pump optical intensities, and they reach the maxima when the pump wavelengths are given as λ p1=9.70 μm and λ p2=10.64 μm respectively. Compared with non-parabolic condition, the total absorption coefficient under parabolic condition shows a blue shift, which is due to the increase in the energy difference between the ground and excited states. By adjusting the two pump optical intensities, the wave vector phase-matching condition inside the AQW is satisfied.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 60801017, 61172010, 61101058, and 61107086) and the Fund from the Science and Technology Committee of Tianjin, China (Grant No. 11JCYBJC01100).
Corresponding Authors:
Cao Xiao-Long
E-mail: caoxiaolong63@126.com
Cite this article:
Cao Xiao-Long (曹小龙), Li Zhong-Yang (李忠洋), Yao Jian-Quan (姚建铨), Wang Yu-Ye (王与烨), Zhu Neng-Nian (朱能念), Zhong Kai (钟凯), Xu De-Gang (徐德刚 ) Intersubband absorption with difference-frequency generation in GaAs asymmetric quantum wells 2012 Chin. Phys. B 21 084207
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