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Physical Review A

Optical precursors with tunneling-induced transparency in asymmetric quantum wells

Yandong Peng, Yueping Niu, Yihong Qi, Haifeng Yao, Shangqing Gong

Published Jan 12, 2011• 38 citations
Publisher

Abstract

A scheme for separating optical precursors from a square-modulated laser pulse through an asymmetric double ${\mathrm{Al}}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}$As/GaAs quantum-well structure via resonant tunneling is proposed. Destructive interference inhibits linear absorption, and a tunneling-induced transparency (TIT) window appears with normal dispersion, which delays the main pulse; then optical precursors are obtained. Due to resonant tunneling, constructive interference for nonlinear susceptibility is created. The enhanced dispersion in a narrow TIT window is about one order of magnitude larger than that of the linear case. In this case, the main pulse is much delayed and the precursor signals are easier to obtain. Moreover, the main pulse builds up due to the gain introduced by the enhanced cross-nonlinearity.

DOI
10.1103/physreva.83.013812

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A scheme for separating optical precursors from a square-modulated laser pulse through an asymmetric double AlxGa1\ensuremath−x{\mathrm{Al}}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}Alx​Ga1\ensuremath−x​As/GaAs quantum-well structure via resonant tunneling is proposed. Destructive interference inhibits linear absorption, and a tunneling-induced transparency (TIT) window appears with normal dispersion, which delays the main pulse; then optical precursors are obtained. Due to resonant tunneling, constructive interference for nonlinear susceptibility is created. The enhanced dispersion in a narrow TIT window is about one order of magnitude larger than that of the linear case. In this case, the main pulse is much delayed and the precursor signals are easier to obtain. Moreover, the main pulse builds up due to the gain introduced by the enhanced cross-nonlinearity.
A scheme is proposed for obtaining high gain and narrow linewidth of a cavity with an asymmetric quantum-well system. Due to resonant tunneling, destructive interference for linear absorption leads to a tunneling-induced transparency window which compresses the cavity linewidth; moreover, constructive interference for cross-nonlinear susceptibility occurs, which introduces high gain and large dispersion, and the cavity linewidth is much compressed. In the latter case, the intensity of cavity transmission could be enhanced one order of magnitude larger than that of input field, and its linewidth could be one-seventieth of the empty cavity.
Optical precursors generated in a quantum-dot-molecule system by an incident square-modulated pulse are theoretically investigated. Voltage-controlled electron tunneling couples two quantum dots instead of a laser field, and a narrow transparency window appears with normal dispersion. The main pulse is delayed due to slow-light effect and the precursor pulses are obtained. We examine the linear susceptibility and find that its one part exhibits normal dispersion and the other one presents anomalous dispersion. Competition between the two parts leads to normal dispersion for the linear susceptibility, which contributes to the above results. Voltage-controlled precursors may be useful to design novel optical devices for generating precursors.
An efficient scheme for subluminal light propagation in asymmetric multiple quantum wells is investigated. In such a system, the linear absorption facilitated by transparency can be controlled through tunneling voltage instead of laser field. It is found that, by varying tunneling voltage between two wells and a suitable choice of detuning, the width of the tunneling-induced transparency (TIT) can be broadened. At the same time, it has been analyzed that the dispersion properties of the weak probe pulse could be changed from superluminal to subluminal within the TIT window. The proposed work may have fruitful applications in switching devices and quantum information processing at low light levels.
In this article, we investigate the spectral broadening of cosh-Gaussian pulses which is induced by self-phase modulation (SPM) within the tunneling-induced transparency (TIT) window in an asymmetric multiple-quantum-well system. The study demonstrates how a single laser field, combined with a steady static electric field, enables dynamic control of absorption and dispersion profiles of the system, offering precise control of the group velocity of the applied field. The multiple-quantum-well system exhibits a large Kerr nonlinearity (approximately ${10}^{6}\phantom{\rule{0.28em}{0ex}}{\text{W}}^{\ensuremath{-}1}\phantom{\rule{0.16em}{0ex}}{\text{m}}^{\ensuremath{-}1}$), which enhances the SPM effect under the TIT window. Our exploration of SPM using cosh-Gaussian pulses demonstrates that higher probe laser powers result in broader spectral widths and increased internal oscillations, especially under strong tunneling strengths. These results suggest promising applications for fine-tuning light propagation in quantum-well systems and offer a more economical approach for optical light-matter interaction experiments, minimizing the need for extensive optics and optomechanical components.