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(a) Oscilloscope traces of the transient photocurrent density and (b) its normalized Fourier spectrum at different external electric field values as indicated together with the spectrum normalization coefficient . Transients were measured for a spatial period of the light interference pattern. The illumination intensity corresponds to an average free-carrier concentration of about . For clarity, the vertical scales of successive photocurrents have been shifted.
(a) Time resolved photocurrent and (b) its normalized Fourier spectrum at two concentrations of the photogenerated carriers: and . Measurements were performed at a fixed grating spacing and dc field .
(Color online) Normalized Fourier spectra at a stable operating point where the system parameters are the following: grating spacing , averaged free-carrier concentration , and applied field . The inset shows the photocurrent transient of the indicated spectrum.
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