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Ultrafast intersubband photocurrent response in quantum-well infrared photodetectors (1997)

Ehret, S. ; Schneider, H. ; Fleissner, J. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 71 (1997), S. 641-643

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: 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.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.119815

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