| Autor: |
Steinkogler, S., Schneider, H., Rehm, R., Walther, M., Koidl, P. |
| Předmět: |
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| Zdroj: |
Applied Physics Letters; 10/28/2002, Vol. 81 Issue 18, p3401, 3p, 4 Graphs |
| Abstrakt: |
We report on the time-resolved photocurrent response of an InGaAs/GaAs quantum-well infrared photodetector stimulated by infrared fs-laser pulses (~9 μm wavelength). We observe two dynamic photocurrent components, which are driven by the optical excitation and by the photoinduced space charge, respectively. The ratio of the time-averaged values of these two components allows us to determine the photoconductive gain. These gain values exhibit a good quantitative agreement with the gain obtained from continuous waves measurements of the peak responsivity. Furthermore, we present a detailed study of the decay time constant of the slow component as a function of the temperature and the bias voltage and compare our results with a recent theoretical model. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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