volume | PIER Journals

Abstract

We calculated analytic expressions for the absorption coefficient (ACF) of a weak electromagnetic wave (EMW) by confined electrons in cylindrical quantum wires (CQW) in the presence of laser radiation by using the quantum kinetic equation for electrons in the case of electron-optical phonon scattering. The ACF of a weak EMW depends on the intensity E₀₁ and frequency Ω₁ of the external laser radiation (E₁ = E₀₁sin(Ω₁t+φ₁)); the intensity E₀₂ and frequency Ω₂ of the weak EMW (E₂ = E₀₂sin(Ω₂t)), the temperature T of the system and the radius R of CQW. Then, the analytic results are numerically calculated and discussed for GaAs/AlAs CQW. The numerical results show that the ACF of a weak EMW in a CQW can have negative values. So, in the presence of laser radiation, under proper conditions, the weak EMW is increased. This is different from the similar problem in bulk semiconductors and from the case of the absence of laser radiation.

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Dr. Nguyen Thi Thanh Nhan

Dr. Nguyen Vu Nhan