Ultrafast laser-induced subwavelength structures towards nanoscale: the significant role of plasmonic effects

Details Ultrafast laser-induced subwavelength structures towards nanoscale: the significant role of plasmonic effects Ultrafast laser-induced subwavelength structures towards nanoscale: the significant role of plasmonic effects

2011-09-30

arxiv.org/abs/1109.6780v1

Physics

Optics

11 pages, 6 figures, submitted to Scientific Reports on April 1st, 2011

Scientific paper

Nowadays, aiming at manipulating light beyond diffraction limit, plasmonics based on elaborate artificialities benefiting from the advance of nano-manufacturing has aroused great interest. Here, we demonstrate ultrafast active plasmonic structures - ultrafast laser-induced deep-subwavelength gratings (DSGs) - spontaneously generated in virtue of plasmonic effects rather than human innovation. The evidence that DSGs can derive from grating splitting reveals the plasmonic essence of the phenomenon - the conversion of surface plasmon (SP) modes. More generally, the universal scaling-down of ultrafast laser-induced structures towards nanoscale originates in the physical regime for plasmonic interaction turning from optical regime to electrostatic regime - the quasistatic SPs, which would bring laser-solid-matter interaction far beyond diffraction limit and ultrafast, non-thermal ablation for extraordinary electrostatic enhancement. In short, the SP-related mechanisms that are high significant for clarifying the physical essence of ultrafast laser-solid-matter interaction in deep-subwavelength scale, can provide a comprehensive picture for understanding ultrafast laser-induced nanostructures.

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