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Optical Engineering

Multiple Quantum Well Spatial Light Modulators For Optical Processing Applications
Author(s): T. Y. Hsu; Uzi Efron; W. Y. Wu; J. N. Schulman; I. J. D'Haenens; Yia-Chung Chang
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Paper Abstract

In this paper recent theoretical and experimental work in the area of multiple quantum well (MQW) modulators for optical processing applications is presented. The theoretical work includes the application of the effective mass approximation to compositional MQW structures and the use of a two-band tight-binding approximation to doping-modulated nipi structures. The theoretical calculations are used to obtain electric-field-dependent absorption and refractive index in the above MQW structures. The experimental results of a 4µm thick GaAs/GaAIAs MQW modulator show an ~ 10:1 on/off ratio with an applied voltage of ~ 20 V (absorption change ~ 6000 cm-1 at E ~ 50 kV/cm) and ~0.4 rad of phase shift with an applied voltage of 10 V (~0.04 at E ~25 kV/cm). Such high electro-optical modulations have previously been reported only in the MQW optical waveguide modulator. Concepts of photoactivated, electrically addressed MQW spatial light modulators and IR-to-visible MQW spatial light modulators are presented. Finally, theoretical evaluation of quantum dot arrays and their potential use in spatial light modulators are discussed.

Paper Details

Date Published: 1 May 1988
PDF: 13 pages
Opt. Eng. 27(5) 275372 doi: 10.1117/12.7976686
Published in: Optical Engineering Volume 27, Issue 5
Show Author Affiliations
T. Y. Hsu, Hughes Research Laboratories (United States)
Uzi Efron, Hughes Research Laboratories (United States)
W. Y. Wu, Hughes Research Laboratories (United States)
J. N. Schulman, Hughes Research Laboratories (United States)
I. J. D'Haenens, Hughes Research Laboratories (United States)
Yia-Chung Chang, University of Illinois (United States)

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