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Proceedings Paper

High-speed photocurrent in quantum well infrared photodetectors
Author(s): Harald Schneider; Peter Koidl; Martin Walther; Z. Lao; Michael Schlechtweg
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Paper Abstract

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 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.

Paper Details

Date Published: 26 October 1999
PDF: 7 pages
Proc. SPIE 3794, Materials and Electronics for High-Speed and Infrared Detectors, (26 October 1999); doi: 10.1117/12.366729
Show Author Affiliations
Harald Schneider, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Peter Koidl, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Martin Walther, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Z. Lao, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Michael Schlechtweg, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)


Published in SPIE Proceedings Vol. 3794:
Materials and Electronics for High-Speed and Infrared Detectors
Walter F. Kailey; Stephen M. Goodnick; Randolph E. Longshore; Walter F. Kailey; Randolph E. Longshore; YongHang Zhang, Editor(s)

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