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We experimentally and theoretically investigate the Gouy phase shift of the longitudinal terahertz (THz) wave in the entire focal region. By comparing the pulses shape and orientation before and after the focus, we find that the complete Gouy shift for the longitudinal field components is same to that of the transverse field components, with the value of π. The only different between them is their...
Intrinsic property of terahertz intervalley transfer gain in bulk GaAs have been investigated by time-domain terahertz spectroscopy. The cutoff frequency for the gain can reach ~750 THz for F>50 kV/cm at 10 K.
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