Terahertz generation from laser-driven ultrafast current propagation along a wire target
Terahertz generation from laser-driven ultrafast current propagation along a wire target
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激光驱动的超快电流沿线目标传播产生太赫兹
DOI：
10.1103/physreve.95.013201
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发表时间：
2017
影响因子：
2.4
通讯作者：
Zhou C. T.
中科院分区：
文献类型：
--
作者：
Zhuo H. B.;Zhang S. J.;Li X. H.;Zhou H. Y.;Li X. Z.;Zou D. B.;Yu M. Y.;Wu H. C.;Sheng Z. M.;Zhou C. T.
利用粒子模拟方法研究了强激光脉冲斜入射金属丝靶产生强相干太赫兹辐射的过程。激光加速的快电子被限制并沿着导线的表面沿着引导，然后导线就像载流线天线一样，在适当的条件下可以发射太赫兹范围内的电磁辐射。当驱动激光强度和脉冲宽度为fs时，在丝材表面产生大于10 KA的瞬态电流。得到的mJ（GV/m峰值电场）THz辐射的发射锥角为。激光到THz能量的转换效率为。一个简单的分析模型，很好地再现模拟结果。
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 intensityand pulse durationfs, a transient current above 10 KA is produced on the wire surface. The emission-cone angle of the resultingmJ (GV/m peak electric field) THz radiation is. The conversion efficiency of laser-to-THz energy is. A simple analytical model that well reproduces the simulated result is presented.