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Time-dependent terahertz pulses transmitted through InGaAs:ErAs samples. The black and the blue curves represent the transmitted terahertz pulses before and after optical excitation , respectively. Amplitudes are normalized to the unexcited pulse amplitude maximum. The inset shows a cross-sectional view of the sample.
OPTP measurements at various pump fluences with 800 nm pump. (a) Pump-induced transmission change normalized to the unexcited terahertz amplitude maximum as a function of pump delay. (b) Photoinduced conductivity (left -axis) and carrier density (right -axis) vs time delay.
(a) Transmission change normalized to unity at different fluences. Smooth gray curves show the biexponential fit. (b) Fluence dependent carrier lifetimes: black dots are the measured values and the solid line is the exponential growth fitting.
Transient reflectivity changes measured in 1550 nm optical pump-probe experiments as a function of pump delay. For comparison is normalized to unity.
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