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(a) TEM image of QD sample surface morphology. THz polarization parallel and perpendicular to the dot chains is indicated. (b) Schematic diagram of the sample (not to scale) showing arrangement of QDs on 1D WLs.
Normalized transient differential THz transmission, , at for the THz polarization and to the dot chains. The sample was excited with pump pulses with a fluence of . The transient response from a SI sample is shown for comparison.
(a) Normalized for the THz polarization to the dot chains at three different temperatures, and (b) amplitudes of the fast and slow components. (c) Normalized for the orientation at three temperatures, and (d) corresponding component amplitudes. The pump fluence was held at for all temperatures.
scans for the (a) and (b) orientations at for the fluences listed. (c) Dependence of the amplitude of the slow component with photoexcited carrier density for each polarization orientation at .
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