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This paper summarizes the latest advances in THz optoelectronics and exploits this technology for two studies of THz nonlinearities that goes beyond the perturbative regime. In the first study, intense multi-terahertz fields are used to coherently promote optically dark and dense 1s para excitons in the Cu2O semiconductor into the 2p state. By utilizing the ultrabroadband electro-optic sampling, the...
The ultrafast charge-carrier dynamics in single-wall carbon nanotubes (NTs) have been investigated by time-resolved THz spectroscopy. Both the equilibrium and non-equilibrium conductivity data of the NTs in the far-infrared (FIR) spectral range from 1 to 40 THz are dominated by optical transitions across the band gap of tubes with gap energies of ~ 10 meV. A simple model based on an ensemble of two-level...
Ultrashort broadband THz pulses are applied to probe the electron dynamics of various gases following ionization by an intense femtosecond laser pulse. The dielectric function of the plasma is found to be Drude-like and yields the temporal evolution of the density and collision rate of the free electrons. The electron decay in a plasma with molecular ions such as O2+ is much faster than in monatomic...
Time resolved photoemission is employed to study Bi2Sr2CaCu2O8+delta. The photoexicted electrons dissipate their energy on two distinct timescales (110 fs and 2 ps). This is attributed to the generation and subsequent decay of non-equilibrium phonons, respectively.
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