論文

査読有り
2020年7月5日

Effects of Pulse Duration and Heat on Laser-Induced Periodic Surface Structures

International Journal of Automation Technology
  • Shuhei Kodama
  • ,
  • Keita Shimada
  • ,
  • Masayoshi Mizutani
  • ,
  • Tsunemoto Kuriyagawa

14
4
開始ページ
552
終了ページ
559
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.20965/ijat.2020.p0552
出版者・発行元
Fuji Technology Press Ltd.

Compared with traditional nanotexturing methods, an ultrashort-pulsed laser is an efficient technology of fabricating nanostructures called laser-induced periodic surface structures (LIPSS) on material surfaces. LIPSS are easily fabricated when the pulse duration is shorter than collisional relaxation time (CRT). Accordingly, ultrashort-pulsed lasers have been mainly used to study LIPSS, but they unstably irradiate while requiring high costs. Although long-pulsed lasers have low cost and high stability, the phenomena (such as the effect of pulse duration, laser wavelength, and heat) of the LIPSS fabricated using short-pulsed lasers with the pulse duration close to the maximum CRT, which is greater than femtosecond, have not been clarified. However, the nanosecond pulse laser has been reported to produce LIPSS, but those were unclear and ununiform. In this study, the short-pulsed laser with the pulse duration of 20 ps, which is close to the maximum CRT, was employed to clarify the effects of pulse duration and heat on the fabrication of LIPSS and to solve problems associated with ultrashort-pulsed lasers. First, a finite-difference time-domain simulation was developed at 20-ps pulse duration to investigate the effects of irradiation conditions on the electric-field-intensity distribution. Subsequently, experiments were conducted using the 20-ps pulse laser by varying conditions. The aspect ratio of the LIPSS obtained was greater than that of the LIPSS fabricated using ultrashort-pulsed lasers, but LIPSS were not fabricated at 355- and 266-nm laser wavelength. In addition, the short-pulsed laser experienced thermal influences and a cooling material was effective for the fabrication of LIPSS with high-aspect-ratio. This demonstrates the effects of pulse duration close to the CRT and heat on the fabrication of LIPSS.

リンク情報
DOI
https://doi.org/10.20965/ijat.2020.p0552
URL
https://www.fujipress.jp/main/wp-content/themes/Fujipress/phyosetsu.php?ppno=IJATE001400040003
ID情報
  • DOI : 10.20965/ijat.2020.p0552
  • ISSN : 1881-7629
  • eISSN : 1883-8022

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