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Electromagnetically Induced Transparency in Quantum Wells

Leonardo Silvestri, F. Bassani, G. Czajkowski

Published Apr 1, 2002• 8 citations
Publisher

Abstract

We show how to compute nonlinear optical absorption spectra of an asymmetric double quantum well in the region of intersubband electronic transitions. The method uses the microscopic calculation of the dephasing due to electron–electron and electron–phonon scattering rates and the macroscopic real density matrix approach to compute the electromagnetic fields and susceptibilities. For a proper choice of the QW widths and of the driving fields we obtain electromagnetically induced transparency. Results are given for GaAs/GaAlAs QWs and experiments are proposed.

DOI
10.1002/1521-396x(200204)190:3<683::aid-pssa683>3.0.co;2-3

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We study the linear and nonlinear optical response of intersubband transitions in a semiconductor quantum well. We describe the coupling of the quantum well structure with the electromagnetic field by using the nonlinear density matrix equations, in the two-subband approximation. We provide proper approximate analytical solutions to these equations that are used for the closed-form determination of the optical susceptibilities χ(1), χ(3), and χ(5). We also explore the dependence of χ(1), χ(3), and χ(5) on the electron sheet density for a specific double GaAs/AlGaAs quantum well.
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In this article, we have investigated the optical properties of intersubband transitions in an asymmetric AlGaAs/GaAs coupled quantum wells system. We solved the Schrödinger equation numerically using homemade finite difference codes to determine the electronic structure. The susceptibilities were calculated in frame of density matrix equations. The effect of relative phase variation between applied fields, on the linear absorption coefficients, relative refractive index changes, and group velocity has been investigated. The results show that the linear optical properties are extremely phase-dependent. By adjusting the phase, it is possible to obtain absorption curves with dispersion-like profile and vice versa.