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タイトル: | Nanograting formation on metals in air with interfering femtosecond laser pulses |
著者: | Miyazaki, Kenzo Miyaji, Godai Inoue, Toshishige |
著者名の別形: | 宮崎, 健創 |
発行日: | 17-Aug-2015 |
出版者: | AIP Publishing |
誌名: | Applied Physics Letters |
巻: | 107 |
号: | 7 |
論文番号: | 071103 |
抄録: | It is demonstrated that a homogeneous nanograting having the groove period much smaller than the laser wavelength (∼800 nm) can be fabricated on metals in air through ablation induced by interfering femtosecond laser pulses (100 fs at a repetition rate of 10 Hz). Morphological changes on stainless steel and Ti surfaces, observed with an increase in superimposed shots of the laser pulses at a low fluence, have shown that the nanograting is developed through bonding structure change at the interference fringes, plasmonic near-field ablation to create parallel grooves on the fringe, and subsequent excitation of surface plasmon polaritons to regulate the groove intervals at 1/3 or 1/4 of the fringe period over the whole irradiated area. Calculation for a model target having a thin oxide layer on the metal substrate reproduces well the observed groove periods and explains the mechanism for the nanograting formation. |
著作権等: | © 2015 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. |
URI: | http://hdl.handle.net/2433/201897 |
DOI(出版社版): | 10.1063/1.4928670 |
出現コレクション: | 学術雑誌掲載論文等 |
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