H. B. Zhuo, S. J. Zhang, X. H. Li, H. Y. Zhou, X. Z. Li, D. B. Zou, M. Y. Yu, H. C. Wu, Z. M. Sheng, and C. T. Zhou
Phys. Rev. E 95, 013201 – Published 5 January 2017
https://journals.aps.org/pre/abstract/10.1103/PhysRevE.95.013201
Generation of intense coherent THz radiation by obliquely incidenting an intense laser pulse on a wire target is studied using particle-in-cell simulation. The laser-accelerated fast electrons are confined and guided along the surface of the wire, which then acts like a current-carrying line antenna and under appropriate conditions can emit electromagnetic radiation in the THz regime. For a driving laser intensity ∼3×1018W/cm2 and pulse duration ∼10 fs, a transient current above 10 KA is produced on the wire surface. The emission-cone angle of the resulting ∼0.15 mJ (∼58 GV/m peak electric field) THz radiation is ∼30∘ . The conversion efficiency of laser-to-THz energy is ∼0.75% . A simple analytical model that well reproduces the simulated result is presented.
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