volume | PIER Journals

2010-07-03

The Influences of Confined Phonons on the Nonlinear Absorption Coefficient of a Strong Electromagnetic Wave by Confined Electrons in Doping Superlattices

Nguyen Quang Bau,

Dr. Nguyen Quang Bau

Department of Physics, College of Natural Science

National University in Hanoi

Vietnam

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Do Manh Hung,

Dr. Do Manh Hung

Department of Physics, College of Natural Science

National University in Hanoi

Vietnam

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Le Thai Hung

Dr. Le Thai Hung

Department of Physics, College of Natural Sciences

Hanoi National University

Viet Nam

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Progress In Electromagnetics Research Letters, Vol. 15, 175-185, 2010

doi:10.2528/PIERL10030911 | Google Scholar

Abstract

The influences of confined phonons on the nonlinear absorption coefficient (NAC) by a strong electromagnetic wave for the case of electron-optical phonon scattering in doped superlattices (DSLs) are theoretically studied by using the quantum transport equation for electrons. The dependence of NAC on the energy (hΩ), the amplitude (E₀) of external strong electromagnetic wave, the temperature (T) of the system, is obtained. Two cases for the absorption: Close to the absorption threshold ∣khΩ - hω₀∣<< ε and far away from the absorption threshold ∣khΩ - hω₀∣>> ε (k = 0, 1, 2..., hω₀ and ε are the frequency of optical phonon and the average energy of electrons, respectively) are considered. The formula of the NAC contains a quantum number m characterizing confined phonons. The analytic expressions are numerically evaluated, plotted and discussed for a specific of the n-GaAs/p-GaAs DSLs. The computations show that the spectrums of the NAC in case of confined phonon are much different from they are in case of un-confined phonon and strongly depend on a quantum number m characterizing confinement phonon.

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Nguyen Quang Bau, Do Manh Hung, and Le Thai Hung, "The Influences of Confined Phonons on the Nonlinear Absorption Coefficient of a Strong Electromagnetic Wave by Confined Electrons in Doping Superlattices," Progress In Electromagnetics Research Letters, Vol. 15, 175-185, 2010.
doi:10.2528/PIERL10030911

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