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Acta Physica Polonica A

Dynamical and Steady State Processes of Probe Absorption-Dispersion in a Four-Level Quantum Dot Nanostructure

E. Asadi Amirabadi, M. Jamshidnejad, Sedigheh Miraboutalebi, Seyyed Hossein Asadpour

Published Jun 1, 2017• 1 citation
Publisher

Abstract

In this paper, we investigated the transient electron population and the transient behaviour of the dispersion, absorption and refractive property of weak probe light in a four-level InGaN/GaN quantum dot nanostructure.In order to achieve the wave functions and their corresponding energy levels of the mentioned quantum dot nanostructure, the Schrödinger and Poisson equations is solved selfconsistently for carriers (here electron) in quantum dot.Our findings show that the properties of transient processes can be dramatically affected by parameters such as intensity, detuning and relative phase of applied fields.Our proposed scheme provides a realistic model for transient control of refraction index properties in a quantum dot nanostructure.These results may have potential applications in high speed optical switch for quantum information technologies.

DOI
10.12693/aphyspola.131.1460

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In this paper, we investigated the transient electron population and the transient behaviour of the dispersion, absorption and refractive property of weak probe light in a four-level InGaN/GaN quantum dot nanostructure.In order to achieve the wave functions and their corresponding energy levels of the mentioned quantum dot nanostructure, the Schrödinger and Poisson equations is solved selfconsistently for carriers (here electron) in quantum dot.Our findings show that the properties of transient processes can be dramatically affected by parameters such as intensity, detuning and relative phase of applied fields.Our proposed scheme provides a realistic model for transient control of refraction index properties in a quantum dot nanostructure.These results may have potential applications in high speed optical switch for quantum information technologies.
Abstract In this letter, we investigated the behaviors of the absorptive–dispersive properties of weak probe light in a four-level InGaN/GaN quantum dot nanostructure. In order to achieve the wave functions and their corresponding energy levels of the mentioned quantum dot nanostructure, Schrödinger and Poisson equations must be solved self consistently for carriers (here electrons) in quantum dots. The enhanced refractive index with amplification can be obtained via adjusting the corresponding controllable parameters such as intensity, detuning and relative phase of the applied fields. Our proposed scheme provides a realistic model for controlling the index of refraction in a quantum dot nanostructure.
The dispersion behaviors of weak probe light in an InGaN/GaN quantum dot (QD) nanostructure driven by a coherent coupling field is investigated. InGaN/GaN QD nanostructure is designed numerically by solving the Schrödinger–Poisson coupled equations. By specific values of QD radius, an appropriate four-level QD nanostructure which is suitable for interaction by a weak probe light and a coherent coupling field is designed. It is shown that switching from normal to anomalous dispersion can be achieved by the intensity of coupling field. Therefore, fast light propagation in this model can be obtained by reduced absorption.
We theoretically analyze the transient properties of a probe field absorption and dispersion in a coupled semiconductor double-quantum-dot nanostructure. We show that in the presence of the Gaussian laser beams, absorption and dispersion of the probe field can be dramatically influenced by the relative phase between applied fields and intensity of the Gaussian laser beams. Transient and steady-state behaviors of the probe field absorption and dispersion are discussed to estimate the required switching time. The estimated range is between 5–8 ps for subluminal to superluminal light propagation .
With the presence of the signal pulse, a quantum dot (QD) four-level structure interacting with four fields forms a double-cascade configuration. The linear optical properties for amplification, absorption, and dispersion of two weak near-infrared (NIR) lights in this scheme are investigated. It shows that the amplification, transparency, normal and anomalous dispersion of the probe and signal fields, i.e., the two NIR waves, can be achieved by adjusting the relative phase of the applied lasers, the probe detuning, and the two pump Rabi energies appropriately, while when the signal pulse is removed, the nonlinear optical phenomenon four-wave mixing (FWM) originating from quantum interference is demonstrated. A highly efficient FWM process with a NIR mixing field generated can be realized in this system. Such investigation in a semiconductor QD system with flexible design and widely adjustable parameters may provide new possibilities for realizing the efficient generation and gain of NIR waves and manipulating light propagation between subluminal and superluminal in the solid-state materials.