The impact of confined phonons on the nonlinear absorption coefficient of a strong electromagnetic wave by confined electrons in compositional superlattices
Main Article Content
Abstract
Abstract. The impact of confined phonons on the nonlinear absorption coefficient (NAC) of a strong electromagnetic wave (EMW) by confined electrons in compositional superlattices is theoretically studied by using the quantum transport equation for electrons. The dependence of the NAC on the energy (), the amplitude (Eo) of external strong EMW, the temperature (T) of the system and the period (dA) of compositional superlattices is obtained in both case of confined and unconfined phonons. Two cases for the absorption: Close to the absorption threshold and far away from the absorption threshold (; and are the energy of optical phonon and the average energy of electrons, respectively) are considered. The analytic expressions are numerically evaluated, plotted and discussed for a specific of the GaAs-Al0.3Ga0.7As compositional superlattices. There are more resonant peaks appearing and the values of of the NAC are much larger than they are in case of unconfined phonons.
References
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[8] Nguyen Quang Bau and Tran Cong Phong, J. Phys. Soc. Jpn. 67, (1998), 3875
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[10] S.Schmit-Rink, D.S.Chemla and D.A.B.Miler, Adv. Phys. 38, (1989),89.
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[14] Q.Bau, L. T. Hung, and N. D. Nam, J. of Electromagn. Waves and Appl. 24, (2010),1751.
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