Key parameters for surface plasma wave excitation in the ultra-high intensity regime

Abstract

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Surface plasma wave excited by laser pulse obliquely incident on a double-layer plasma target and ts application

“…理相关领域的重视 [1,2] 。1998 年 T. W. Ebbesen 等人从实验上发现，孔径为亚波 长的金属薄板孔阵，在满足 SPW 激发条件下，具有显著的反常透射增强效应， 使得 SPW 相关的研究再次引起广泛关注 [3][4][5][6] 。强激光会瞬间使物质(不限于金 属)电离成为等离子体；在超强超短激光与等离子体相互作用领域，高密度 (密度远高于临界密度)等离子体靶表面的电子密度分布会显著影响激光与等 离子体的耦合，因此强激光驱动的 SPW 激发以及 SPW 与强激光的共振耦合， 在粒子加速 [7][8][9][10] 、相干或非相干 x 射线产生 [11] ，温稠密物质态的研究 [12] 等等均 有重要的科学价值。而探索如何利用强激光在高密度等离子体靶表面激发大振 幅的 SPW 就有重要的研究意义和实际应用价值。 强激光与弱激光在激发表面波上有明显的区别。激光强度𝐼 ∝ 𝐸 2 能激发表面波 [13,14] ，其波矢𝑘 𝑆𝑃𝑊 满足如下色散关系：…”

Electron acceleration by laser plasma wedge interaction

“…In order to promote the particle acceleration, various designs were proposed and studied in detail, either involving the broad category of Laser Wakefield Acceleration (LWFA) [4], or the interaction of a laser with an overdense plasma , the focus of our work. Among the latter, electron acceleration by resonantly excited relativistic surface plasma waves (SPW) [5][6][7][8][9][10][11] has been demonstrated, leading to high charge, ultrashort bunches along the target surface, reaching energies largely above their quiver energy and correlated in time and space with extreme ultraviolet (XUV) harmonic emission [8]. Advanced methods to control the duration and energy of the electron bunches have been proposed [10].…”