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Normalized peak amplitude of the terahertz transients as a function of the power of the cw background illumination. The average power of the pulsed beam was kept constant at . Inset: terahertz transients obtained at an applied bias of , both with and without background illumination.
Peak amplitude of the terahertz pulses as a function of time delay between the two pump pulses (peak amplitude meaning the terahertz signal at the time-delay-zero position of the electro-optical detection unit). Upper panel: data of device PC1 for different values of (gray curve: ). Lower panel: A trace of PC2 for with a graphical illustration of the two quantities and . Note the different time scales of the upper and lower panels. Inset: and extracted from the data of PC1 as a function of the total incident optical power.
Descreening time vs total incident optical power. Inset: of the upper panel of Fig. 2 vs photocurrent .
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