Ultrafast intersubband photocurrent response in quantum-well infrared photodetectors
作者:
S. Ehret,
H. Schneider,
J. Fleissner,
P. Koidl,
G. Bo¨hm,
期刊:
Applied Physics Letters
(AIP Available online 1997)
卷期:
Volume 71,
issue 5
页码: 641-643
ISSN:0003-6951
年代: 1997
DOI:10.1063/1.119815
出版商: AIP
数据来源: AIP
摘要:
We report on a high bandwidth measurement of the transient intersubband photocurrent of a GaAs/AlGaAs multiple quantum-well infrared photodetector (QWIP). The photocurrent is excited via tunable subpicosecond infrared pulses. The response time of the detector has a full width at half-maximum of 18.5 ps and a rise time of 14.5 ps, which is limited by the electrical circuit. The decay time of the photocurrent response exhibits a significant dependence on the applied voltage, with increasing decay times for increasing bias voltages. From the experimental data, we conclude that the intrinsic response time of a QWIP is less than 7 ps. ©1997 American Institute of Physics.
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