Theoretical and experimental work shows that electroabsorption improves and the quantum-confined Stark effect becomes stronger in In0.2Ga0.8As/AlxGa1−xAs quantum wells as the aluminum concentration (x) is increased in the barriers. This improved electroabsorption was used in a reflection modulator that exhibited the largest reported reflectivity change of 77%.
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Pezeshki et al. (1991) studied this question.
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