By using step-graded Al compositions of epitaxial AlGaAs, we can form a tapered oxidation front due to the combination of rapid lateral oxidation in a higher Al content layer and slow transverse oxidation into adjacent lower Al content layers. A study of the oxidation behaviour of this epitaxial aperture layer demonstrates the feasibility of tapered dielectric apertures which have been predicted to provide much lower losses in vertical cavity lasers.
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Naone et al. (1997) studied this question.
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