Publication # 104

G. Livescu, D. A. B. Miller, T. Sizer, D. J. Burrows, J. Cunningham, A. C. Gossard, and J. H. English, "High-speed absorption recovery in quantum well diodes by diffusive electrical conduction," Appl. Phys. Lett., 54, 748-750, (1989).

The authors present here picosecond time-resolved electroabsorption measurements in GaAs quantum well p-i-n diode structures. While the dynamics of the vertical transport is not completely understood at present, their data reveal the importance of the 'lateral' propagation of the photoexcited voltage pulse over the area of the doped regions. They propose a two-dimensional 'diffusive conduction' mechanism, which predicts a fast relaxation of the electrical pulse, with time constants ranging from 50 fs to 500 ps, determined by the size of the exciting spot, the resistivity of the doped regions, and the capacitance of the intrinsic region

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