Abstract
The finite longitudinal optical phonon emission time of hot carriers created by nonresonant excitation of short channel photoconductive detectors and the momentum distribution of these electrons are shown to be limiting factors for the response of the detector to an infinitely narrow pulse. Pulse dispersion of the order of 40 ps is caused in In0.53Ga0.47 As/InP detectors with 10-μm channel width after nonresonant excitation at 820 nm in agreement with most recent experiments. Resonant excitation is imperative for a photoconductive detector of ultimate time resolution and sensitivity.
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