Statistics – Applications
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spie.3794...47s&link_type=abstract
Proc. SPIE Vol. 3794, p. 47-53, Materials and Electronics for High-Speed and Infrared Detectors, Stephen M. Goodnick; Walter F.
Statistics
Applications
Scientific paper
Quantum well infrared photodetectors (QWIPs) are very promising for ultrafast photodetection in the 8 - 12 micrometers infrared regime. We report on time-resolved studies of the intersubband photocurrent in GaAs/AlGaAs (QWIPs). The photocurrent is excited by sub-picosecond infrared pulses, which are obtained by difference frequency mixing of the signal and idler waves of an optical parametric oscillator. Using a particular detector geometry with < 900 micrometers (superscript 2) device area, the measured electrical pulses have a full- width at half-maximum of only 16 ps and a 10% - 90% rise time of 13 ps. For practical applications, in particular for heterodyne detection, it is desirable to reduce the noise floor by using a cooled low-noise preamplifier. We have performed experiments with a low-temperature hybrid circuit consisting of a QWIP in connection with a GaAs transimpedance amplifier based on HEMT technology. This configuration yields a rise time of 19 ps at an amplifier gain of approximately 35 dB.
Koidl Peter
Lao Z.
Schlechtweg M.
Schneider Harald
Walther Martin
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