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Chinese Physics Letters

A Theoretical Analysis of Ultraslow Optical Solitons via Exciton Spin Coherence in GaAs/AlGaAs Multiple Quantum Wells

Wei Yan, Tao Wang, Xiao-Ming Li

Published Feb 1, 2013• 2 citations
Publisher

Abstract

We show the formation of ultraslow bright and dark optical solitons in a Λ-type three-level system with a GaAs/AlGaAs multiple quantum well (MQW) structure based on the exciton spin coherence. The propagation of the pulse across the quantum wells is studied analytically and numerically with Maxwell—Schrödinger equations. The research of ultraslow optical solitons of MQWs in the present work may provide important applications in optical devices and optical communication systems.

DOI
10.1088/0256-307x/30/2/027802

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We show the formation of ultraslow bright and dark optical solitons in a Λ-type three-level system with a GaAs/AlGaAs multiple quantum well (MQW) structure based on the exciton spin coherence. The propagation of the pulse across the quantum wells is studied analytically and numerically with Maxwell—Schrödinger equations. The research of ultraslow optical solitons of MQWs in the present work may provide important applications in optical devices and optical communication systems.
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We study the low-intensity light pulse propagation through an asymmetric double quantum well via Fano-type interference based on intersubband transitions. The propagation of the pulse across the quantum well is studied analytically and numerically with the coupled Maxwell-Schr\"odinger equations. We show the generation of ultraslow bright and dark optical solitons in this system. Whether the solitons are dark and bright can be controlled by the ratio of dipole moments of the intersubband transitions. Such investigation of ultraslow optical solitons in the present work may lead to important applications such as high-fidelity optical delay lines and optical buffers in semiconductor quantum wells structure.
We investigate the formation and propagation of optical solitons in an asymmetric double quantum-well structure. Using a standard method of multiple scales we derive a nonlinear Schr\"odinger (NLS) equation with some high-order correction terms that describe effects of linear and differential absorption, nonlinear dispersion, delay response of nonlinear refractive index, and third-order dispersion of a probe field. We show that in order to make slowly varying envelope approximation be valid an excitation scheme of interband transition should be adopted. We also show that for realistic quantum-well parameters the probe field with time length of picosecond or shorter must be used to make dispersion and nonlinear lengths of the system be smaller than absorption length, only by which a shape-preserving propagation of optical solitons is available. In addition, we clarify validity domains for the perturbed NLS equation as well as the high-order NLS equation and provide various optical soliton solutions in different regimes both analytically and numerically. We demonstrate that the solitons obtained have ultraslow propagating velocity and can be generated under very low input light intensity.
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The possibility of generation and propagation of ultraslow bright optical solitons in asymmetric three-coupled quantum well systems is studied in this paper. These bright solitons owe their existence to Kerr and quintic nonlinearities which arise due to a probe pulse and two controlling laser beams. We also demonstrate numerically that these solitons are stable. The modulation instability of a continuous or quasi-continuous wave probe beam has been also investigated and the role of quintic nonlinearity in suppressing this instability addressed.