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Time-resolved photocurrent response of metal-semiconductor-metal photodetectors to double-pulse excitation.

Zeitaufgelöste Photostromantwort von Metall-Halbleiter-Metall-Photodetektoren bei Doppelpulsanregung


Applied Physics Letters 63 (1993), Nr.20, S.2780-2782
ISSN: 0003-6951
ISSN: 1077-3118
Fraunhofer IAF ()
Doppelpulsanregung; double-pulse excitation; GaAs; metal-semiconductor-metal photodetector; Metall-Halbleiter-Metall-Photodetektor; photocurrent response; Photostromantwort

The photocurrent response of a GaAs metal-semiconductor-metal (SMS) photodetector was measured after excitation with two femtosecond pulses having a variable delay Deltat of 0 ps equal or smaller than Deltat equal or smaller than 100 ps. At low excitation densities the influence of the first pulse on the pulse shape of the second is negligible for Deltat equal or bigger than 20 ps. This corresponds to a resolvable pulse train of 50 GHz repetition rate for the detectors used in our experiments. The influence of space charge effects at higher excitation density and/or lower bias could be shown.