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Journal of the Optical Society of America B

Coulomb and light-induced electronic renormalization in quantum wells for electromagnetically induced transparency and light amplification without inversion

Danhong Huang, Cunkai Wu, Yang Zhao

Published Nov 1, 1994• 9 citations
Publisher

Abstract

With a coherent pump laser coupling two electron levels in quantum wells, Coulomb and light-induced electronic renormalization is investigated according to the density-functional theory. On the basis of the renormalization, the optical response function for intersubband absorption of a probe light beam is studied. Both the electromagnetically induced transparency and the probe light amplification without inversion are observed. The influences of the pump field strength, frequency detuning, electron density, and δ-doping position are determined.

DOI
10.1364/josab.11.002258

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With a coherent pump laser coupling two electron levels in quantum wells, Coulomb and light-induced electronic renormalization is investigated according to the density-functional theory. On the basis of the renormalization, the optical response function for intersubband absorption of a probe light beam is studied. Both the electromagnetically induced transparency and the probe light amplification without inversion are observed. The influences of the pump field strength, frequency detuning, electron density, and δ-doping position are determined.
Summary form only given. In this paper, we present coherent optical effects in a quantum well system with two electron subbands coupled by a pump laser. The Coulomb and light induced electronic renormalization is investigated with generalized density-functional theory. On the basis of the renormalized electron states, the absorption coefficient of a probe light beam is studied for intersubband transition by using a self-consistent field theory. Both the electromagnetically induced transparency (EMIT) and probe light amplification without population inversion are found.
In the presence of a coherent coupling between two electron conduction sub-bands within doped quantum wells, both the Coulomb and light induced electronic renormalizations on electron and hole eigenenergies and eigenstates are studied by employing a generalized density functional approach. The dynamic properties of interband absorption of a probing laser are investigated. Electromagnetically induced transparency in interband transitions and optical switching is shown. The effects on the absorption coefficient due to pump field amplitude, electron area density, inhomogeneous level broadening, and delta -doping layer position are investigated and explained.
When two electron conduction subbands in a doped quantum well are coupled by a coherent laser pumping, electromagnetically induced transparency and Rabi splitting in the interband absorption spectrum of a probe light are found for steady electron dressed states. The effect of light-electron interaction on electron and hole eigenenergies and states are calculated using a generalized density-functional approach. The change of absorption coefficient with the pump field amplitude is studied and explained.
We give a local-field calculation of the dynamic response of a single quantum well (QW) inside a cavity pumped by a strong light beam. The starting point of our theory is the microscopic Maxwell-Lorentz equation combined with light-induced nonlinear current densities associated with intersubband transitions in the QW system. The frequency- and space-dependent current densities are derived from the density-matrix formalism in a nonperturbative manner. Assuming only the electromagnetic coupling from the pump beam to the probe beam is important, we solve the wave equation exactly for both the pump and probe fields. In turn we determine the probe absorption coefficient of the QW structure. For a GaAs/Al0.33{}_{0.33}0.33​Ga0.67{}_{0.67}0.67​As QW placed between vacuum and a GaAs/AlAs distributed Bragg reflector followed by a GaAs prism, we calculate the probe absorption spectra for different parameters such as the pump frequency, the incident intensity of the pump field, and the cavity quality. Our results show that the optical absorption and amplification for the probe field are strongly dependent of these parameters. It is also demonstrated that it is of importance to take into account the dynamic screening effect for the pump field in the calculation of the probe spectra.
This paper presents the current results of field-induced quantum interference in semiconductor quantum wells. Three-level systems with two conduction subbands in single and double quantum wells coupled by a resonant field are studied. We investigate effects of the Coulomb and field-induced electronic renormalizations of the energy subbands and steady eigenstates of electrons. The random-phase and ladder approximations have been used to calculate the linear interband and intersubband optical absorptions and refractive indices. The effect of collective dipole moment on the nonlinear susceptibility has been incorporated into the study by using a local-field approach. Lasing without population inversion, electromagnetically induced transparency, and enhanced nonlinearity with reduced absorption inside the intersubband-coupled single quantum well and dc-field coupled double quantum wells are found.