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arXiv 1307.0979cond-mat.mes-hallphysics.optics
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表面等离子体激元通过粗糙度耦合诱导的Laser诱导周期性表面结构

Laser Induced Periodic Surface Structures Induced by Surface Plasmons Coupled via Roughness

E. L. Gurevich, S. V. Gurevich

摘要:

讨论了飞秒激光诱导周期性表面结构(LIPSS)的形成机理。最常用的理论之一是通过入射激光束与表面等离子体激元-极化激元波之间的干涉来解释这种结构。后者通常归因于入射激光与表面粗糙度的耦合。我们表明,这种表面等离子体激元的激发机制与激光烧蚀实验的结果相矛盾。作为一种替代方法的激发LIPSS,我们分析发展的流体动力学不稳定性的熔体层。

英文摘要:

In this paper the formation mechanisms of the femtosecond laser-induced periodic surface structures (LIPSS) are discussed. One of the most frequently-used theories explains the structures by interference between the incident laser beam and surface plasmon-polariton waves. The latter is most commonly attributed to the coupling of the incident laser light to the surface roughness. We demonstrate that this excitation mechanism of surface plasmons contradicts to the results of laser-ablation experiments. As an alternative approach to the excitation of LIPSS we analyse development of hydrodynamic instabilities in the melt layer.

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