Materials, Photonic Devices, and Sensors

Influence of band nonparabolicity on intersub-band optical absorption in GaAs asymmetric quantum wells by difference frequency generation of two midinfrared waves

[+] Author Affiliations
Xiao-Long Cao

Shandong University of Science and Technology, College of Mechanical and Electronic Engineering, Qingdao, China

Tianjin University, College of Precision Instrument and Opto-electronics Engineering, Institute of Laser and Opto-electronics, Tianjin, China

Tianjin University, Key Laboratory of Opto-electronics Information Technology, Ministry of Education, Tianjin, China

Yong-Li Che, Jian-Quan Yao

Tianjin University, College of Precision Instrument and Opto-electronics Engineering, Institute of Laser and Opto-electronics, Tianjin, China

Tianjin University, Key Laboratory of Opto-electronics Information Technology, Ministry of Education, Tianjin, China

Opt. Eng. 56(3), 037104 (Mar 14, 2017). doi:10.1117/1.OE.56.3.037104
History: Received December 4, 2016; Accepted February 24, 2017
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Abstract.  The linear and nonlinear intersub-band absorption in GaAs asymmetric quantum wells (QWs) by difference frequency generation of two midinfrared waves are theoretically calculated in parabolic and nonparabolic QWs. The calculated results show that terahertz (THz) emission peak shifts in wavelength and THz emission coefficient is substantially reduced after considering band nonparabolicity. For the absorption coefficient of one of the two pump beams, it moves to lower energies by increasing its own wavelength and has little changes with the increase of the other wavelength. The leading causes of these phenomena are the changes of energy levels, the corresponding wave functions, and the transition matrix elements, which are caused by band nonparabolicity. Thus, it is necessary to make an accurate comparison of experimental intersub-band absorption with theoretical predictions.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Xiao-Long Cao ; Yong-Li Che and Jian-Quan Yao
"Influence of band nonparabolicity on intersub-band optical absorption in GaAs asymmetric quantum wells by difference frequency generation of two midinfrared waves", Opt. Eng. 56(3), 037104 (Mar 14, 2017). ; http://dx.doi.org/10.1117/1.OE.56.3.037104


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Few-cycle terahertz generation and spectroscopy of nanostructures. Philos Trans A Math Phys Eng Sci 2004;362(1815):251-60; discussion 260-2.
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