THz-Wave Difference Frequency Generation by Phase-Matching in GaAs/AlxGa1−xAs Asymmetric Quantum Well
CAO Xiao-Long1,2, WANG Yu-Ye1,2, XU De-Gang1,2**, ZHONG Kai1,2, LI Jing-Hui3, LI Zhong-Yang1,2, ZHU Neng-Nian1,2, YAO Jian-Quan1,2
1College of Precision Instrument and Opto-electronics Engineering, Institute of Laser and Opto-electronics, Tianjin University, Tianjin 300072 2Key Laboratory of Opto-electronics Information Technology (Ministry of Education), Tianjin University, Tianjin 300072 3Department of Computer Science and Technology, Renai College, Tianjin University, Tianjin 301636
THz-Wave Difference Frequency Generation by Phase-Matching in GaAs/AlxGa1−xAs Asymmetric Quantum Well
CAO Xiao-Long1,2, WANG Yu-Ye1,2, XU De-Gang1,2**, ZHONG Kai1,2, LI Jing-Hui3, LI Zhong-Yang1,2, ZHU Neng-Nian1,2, YAO Jian-Quan1,2
1College of Precision Instrument and Opto-electronics Engineering, Institute of Laser and Opto-electronics, Tianjin University, Tianjin 300072 2Key Laboratory of Opto-electronics Information Technology (Ministry of Education), Tianjin University, Tianjin 300072 3Department of Computer Science and Technology, Renai College, Tianjin University, Tianjin 301636
摘要An asymmetric quantum well (AQW) is designed to emit a terahertz (THz) wave by using difference frequency generation (DFG) with the structure of GaAs/Al0.2Ga0.8As/Al0.5Ga0.5As under a doubly resonant condition. It is found that the second−order nonlinear susceptibility χ(2) varies with the two pump wavelengths, and it can reach the peak value of 1.61 µm/V when the wavelengths are given as λp1=9.756 µm and λp2=10.96 µm, respectively. The numerical results show that the refractive index of one pump wave in the AQW is concerned with not only its own wavelength but also the other wavelength. Phase-matching inside the AQW can be obtained through the tuning of the two pump wavelengths.
Abstract：An asymmetric quantum well (AQW) is designed to emit a terahertz (THz) wave by using difference frequency generation (DFG) with the structure of GaAs/Al0.2Ga0.8As/Al0.5Ga0.5As under a doubly resonant condition. It is found that the second−order nonlinear susceptibility χ(2) varies with the two pump wavelengths, and it can reach the peak value of 1.61 µm/V when the wavelengths are given as λp1=9.756 µm and λp2=10.96 µm, respectively. The numerical results show that the refractive index of one pump wave in the AQW is concerned with not only its own wavelength but also the other wavelength. Phase-matching inside the AQW can be obtained through the tuning of the two pump wavelengths.
CAO Xiao-Long;WANG Yu-Ye;XU De-Gang;**;ZHONG Kai;LI Jing-Hui;LI Zhong-Yang;ZHU Neng-Nian;YAO Jian-Quan;. THz-Wave Difference Frequency Generation by Phase-Matching in GaAs/AlxGa1−xAs Asymmetric Quantum Well[J]. 中国物理快报, 2012, 29(1): 14207-014207.
CAO Xiao-Long, WANG Yu-Ye, XU De-Gang, **, ZHONG Kai, LI Jing-Hui, LI Zhong-Yang, ZHU Neng-Nian, YAO Jian-Quan,. THz-Wave Difference Frequency Generation by Phase-Matching in GaAs/AlxGa1−xAs Asymmetric Quantum Well. Chin. Phys. Lett., 2012, 29(1): 14207-014207.
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2012, Vol. 29 
