I. V. Oladyshkin, D. A. Fadeev, and V. A. Mironov
We propose a microscopic theory of terahertz (THz) radiation generation on metal gratings under the action of femtosecond laser pulses. In contrast to previous models, only low-frequency currents inside the metal are considered without involving electron emission and acceleration. The presented model generalizes thermal mechanism of THz response for the case of structured surfaces, when temperature gradients inside the electron gas can be enhanced by excitation and absorption of surface plasmons. Performed numerical calculations reproduce specific experimental features like delayed character of THz response and low conversion efficiency when the grating depth is too large.
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