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Publication # 076

M. N. Islam, R. L. Hillman, D. A. B. Miller, D. S. Chemla, A. C. Gossard, and J. H. English, "Electroabsorption in GaAs/AlGaAs Coupled Quantum Well Waveguides," Appl. Phys. Lett. 50, 1098-1100, (1987).

A novel GaAs/AlGaAs coupled quantum well structure, consisting of two 46 AA wells separated by a 11.5 AA barrier, was embedded in a leaky waveguide. Polarization anisotropy and quantum-confined Stark effect absorption changes are observed, and a 14:1 modulator is demonstrated operating at the peak of the first light-hole transition. Although the lowest energy transitions behave as predicted by tunneling resonance calculations, higher energy states exhibit unusual behavior due to valence-band mixing

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