Periodic Nanostructure Formation Induced by Short-range Surface Plasmon Polaritons Excited with Few-cycle Laser Pulses

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  • Iida Yuto
    Graduate School of Engineering, Tokyo University of Agriculture and Technology
  • Miyaji Godai
    Institute of Engineering, Tokyo University of Agriculture and Technology
  • Nikaido Seiya
    Graduate School of Engineering, Tokyo University of Agriculture and Technology

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Other Title
  • 数サイクルレーザーで励起された短距離伝搬型表面プラズモンによるナノ周期構造形成

Abstract

<p>We have demonstrated that 7-fs, ~810-nm laser pulses can produce a much finer periodic nanostructure on a diamond-like carbon (DLC) film than that formed with 100-fs, ~800-nm laser pulses through ablation in air. The minimum period size is ~60 nm, corresponding to ~1/13 of the center wavelength. We report the physical mechanism responsible for finer nanostructuring. It has been found that the thickness of bonding structural changes with 7-fs pulses is much thinner than that with 100-fs pulses. The results show that the 7-fs pulses with high peak power density at low fluence create a few-nm-thick layer with high-density electrons and excite short-range surface plasmon polaritons, which have a large wave number around the layer and induce the plasmonic near-field nanoablation. The period size estimated by using a model target reproduces well the observed size of nanostructures. </p>

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