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THz radiation waveform from the irradiated photoconductive antenna, normalized by the applied static field. The optical excitation power is 2mW at .
Fourier-transformed amplitude spectrum of the waveform in Fig. 1 with 6 ps temporal windowing. The spectrum is centered at 430 GHz and extends beyond 2 THz.
Electric-field amplitudes normalized by the applied electric field as a function of pump fluence for unirradiated sample and samples irradiated at and . The solid curves are the least-squares fit of the data with Eq. (1).
Optical and electrical properties of before and after irradiation at , and dose.
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