Time dependence of the THz electric field with a maximum amplitude of 3.6 MV/cm at the location of the dye molecules. (IMAGE)
Caption
Fig. 2. (a) Time dependence of the THz electric field with a maximum amplitude of 3.6 MV/cm at the location of the dye molecules. (b) Time dependent THz intensity (solid line), corresponding to the absolute square of the THz field in panel (a). The symbols give the absorption change of the dye solution at a frequency of 402 THz (wavelength 746 nm, black arrow in panel (c)) as a function of time delay between the maximum of the THz electric field and the probe pulse. The absorption change follows the THz intensity in time. (c) Stationary absorption spectrum of betaine 30 in DMSO (blue solid line, no THz field) and transient absorption spectra for different delay times (symbols). The change of absorption, i.e., the difference of absorbance with and without THz field, is plotted as a function of probe frequency (bottom abscissa scale) or wavelength (upper abscissa scale). The shape of the transient spectra reflects a spectral broadening with an absorption decrease in the center and absorption increases on the wings of the stationary spectrum. The molecular structure of betaine 30 is shown as an inset.
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MBI/T. Elsaesser
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