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

Xiao-Long Cao; Yong-Li Che; Jian-Quan Yao

doi:10.1117/1.OE.56.3.037104

14 March 2017 Influence of band nonparabolicity on intersub-band optical absorption in GaAs asymmetric quantum wells by difference frequency generation of two midinfrared waves

Xiao-Long Cao, Yong-Li Che, Jian-Quan Yao

Author Affiliations +

Optical Engineering, Vol. 56, Issue 3, 037104 (March 2017). https://doi.org/10.1117/1.OE.56.3.037104

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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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," Optical Engineering 56(3), 037104 (14 March 2017). https://doi.org/10.1117/1.OE.56.3.037104

Received: 4 December 2016; Accepted: 24 February 2017; Published: 14 March 2017

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