Terahertz generation by difference-frequency mixing of exciton Wannier–Stark ladder states in biased semiconductor superlattices
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(a) Interband absorption spectrum (solid line). The theoretical spectrum (long dash line). Three exemplary bichromatic pump spectra: The spectral width of the laser lines are ; . Pump spectrum for which the maximal THz signal was observed (dashed line). (b) Integrated THz power for difference-frequency mixing as function of . Inset: The THz transient for the maximal amplitude (for ) (solid line). Derivative of cross-correlation signal of driving pump pulse (dashed line). (c) Theoretical results corresponding to (b). Inset: The calculated THz transient for the maximal amplitude.
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(a) Interband absorption spectra. The spectrum for (dashed line) is up relative to the spectrum (solid line) by adding a constant factor. The arrows mark the bichromatic spectrum for which the maximal THz signal was measured. (b) Amplitude of the generated THz emission as function of [for (closed symbols) and (open symbols)]. The bar gives the spectral width of the bichromatic excitation. Inset: The frequency of the emitted THz radiation directly follows the splitting frequency of the pump pulse (data taken from experiment at ). (c) Theoretical results corresponding to (b) [for F=9.5 kV/cm (closed symbols) and F=11.5 kV/cm (open symbols)]. Inset: Theoretical result showing the second resonance for driving at the double BO frequency.
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