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Journal of Optics B Quantum and Semiclassical Optics

Dynamical behaviour of photo-excited and voltage biased MQW structures with bistable electro-optical absorption

V. A. Kochelap, L. L. Bonilla, Carlos A. Velasco

Published Jan 1, 1999• 0 citations
Publisher

Abstract

In this work we have studied the dynamics of switch-on and switch-off processes in biased MQW structures where every well shows optical bistability in a light intensity range (l, h). We have analysed in detail MQW structures with negligible inter-well transport. We have found that the switch-on mechanism consists of a time sequence where every QW jumps into the high-absorption state. Therefore a step-like switching wave propagates through the structure. The switch-off process resembles a reverse wave propagating in the opposite direction and step-like processes in the plasma concentration decay. These effects can be used for conversion of an analogue optical signal to digital (optical and electrical) signal(s).

DOI
10.1088/1464-4266/1/1/016

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In this work we have studied the dynamics of switch-on and switch-off processes in biased MQW structures where every well shows optical bistability in a light intensity range (l, h). We have analysed in detail MQW structures with negligible inter-well transport. We have found that the switch-on mechanism consists of a time sequence where every QW jumps into the high-absorption state. Therefore a step-like switching wave propagates through the structure. The switch-off process resembles a reverse wave propagating in the opposite direction and step-like processes in the plasma concentration decay. These effects can be used for conversion of an analogue optical signal to digital (optical and electrical) signal(s).
In this work we have studied the dynamics of switch-on and switch-off processes in biased MQW structures where every well shows optical bistability in a light intensity range (I l ,I h ).We have analyzed in detail MQW structures with negligible inter-well transport.We have found that the switch-on mechanism consists of a time sequence where every QW jumps into the highabsorption state.Therefore a step-like switching wave propagates through the structure.The switchoff process resembles a reverse wave propagating in the opposite direction and step-like processes in the plasma concentration decay.These effects can be used for conversion of an analog optical signal to digital (optical and electrical) signal(s).
The propagation of a laser pulse through a GaAs-GaAlAs MQW is investigated in the frame of classical optics. Optical spectra are calculated in the vicinity of the 1 s -exciton resonance of GaAs taking into account interference effects and nonlinear absorption caused by many-exciton effects at high excitation. The density of excited e-h pairs and intensities of transmitted and reflected beam are determined in dependence on the intensity of stationary incident laser beam by simultaneous solution of the problem of exciton diffusion and propagation of the electromagnetic wave. The observed strong nonlinearities refer to an optical bistable behaviour.
The quantum confined Stark effect has found wide application in devices for optical modulation and bistable switching. Whilst normally-incident strained layer modulators and self electro-optic effect devices (SEEDs) have been demonstrated [1-3], the introduction of strain has provided little performance advantage. Recently there has been a growing interest in the properties of strained piezoelectric structures resulting from growth on orientations other than the (100) [4-6]. In this communication we present the results of an investigation of the electro-optical absorption modulation properties of a strained InGaAs/GaAs multiple quantum well p-i(MQW)-n grown on a (111)B GaAs substrate. Subsequently we demonstrate optical bistability using the self electro-optic effect without the application of an external bias.
Recently, we predicted1) that partial sample switching can occur in a system showing resonatorless optical bistability due to induced absorption. For an increasing intensity of the incident light, a stepwise propagation of the kink in the excitation profile takes place. In the meantime, the corresponding modulation of the transmitted light has been observed in sharp-cut color filters2). Here, we present an in-depth study of the structure, formation and motion of the kinks. We supplement and expand our original numerical investigations1) by detailed analytical studies. We show that the kink profile may be approximated by a soliton structure if the diffusion of the excitation density is taken into account. Furthermore, we present some simple estimates for the kink propagation.
Abstract The dynamics of optical nonlinearities connected with the blue‐shift of the exciton line in resonantly excited GaAs–GaAlAs MQWS's is investigated theoretically simulating a two‐beam experiment. Jumps in the optical spectra of a weak test pulse (optical switching), which follows the intense pump pulse at different time delays, are observed, basing on a strong increase of the absorption. A similar mechanism of the bistability is observed in connection with the electro‐absorptive effect.