The signal-bandwidth products of excitonic electroabsorption of low-temperature-growth (LTG) molecular beam epitaxial films of GaAs:As and Al0.25Ga0.75As:As are larger than in the related stoichiometric materials. The enhanced electro-optic properties of these composites may be caused by increased inhomogeneity of dc electric fields. The differential transmission in LTG Al0.25Ga0.75As:As annealed at 750 °C for 30 s is relatively broadband and approaches 60% for dc electric fields of only 1.5×104 V/cm.
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Nolte et al. (1993) studied this question.
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