Abstract
We present a new versatile and simple pump-and-probe technique to measure the change in reflectivity (ΔR) and to time resolve the signal in a time scale faster than the responsivity of the detector used. Also, by slightly changing the experimental conditions, decay times ranging from 0.2 ns to 0.1 ms can be measured. This technique presents the advantage of eliminating in a natural way any undesirable photoluminescence or background signal. Important parameters for carrier dynamics studies are extracted from the time-resolved signal obtained. In addition, no contribution to the change in reflectivity due to band-filling effects was observed.
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