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Experimental analysis shows increased transmission of terahertz fields in thin gold films, suggesting electron dynamics enhance nonlinearity.
This study reports on a nonlinear response in thin gold films in the terahertz (THz) frequency region. In an experimental study, the THz‐electric peak field strength is increased and the transmission through the gold film is found to increase nonlinearly with the field strength when it exceeds a few hundred kV cm −1 . Numerical calculations of the electron dynamics based on the momentum‐resolved Boltzmann equation show that the fast ((sub‐) picosecond) electron depolarization activates a THz field‐induced Pauli blocking nonlinearity of the electron–phonon interaction, resulting in an increased transmission.
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Jutas et al. (2025) studied this question.
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