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Streamer propagation model for high-gain photoconductive switching

A streamer model for high gain photoconductive switching in GaAs is proposed and described. The electric field associated with the streamer is strongly inhomogeneous, having a peak intensity at the streamer tip several times larger than the average applied field. Such a large field incites impact ionization effectively, allowing the streamer to propagate at speeds well in excess of the saturated drift velocity. This model is consistent with all observations of high gain photoconductive switching, including transient measurements.