期刊
LASER PHYSICS LETTERS
卷 10, 期 5, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1612-2011/10/5/056004
关键词
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资金
- Russian Foundation for Basic Research [10-08-00941a, 11-02-01202-a, 11-08-01165-a, 12-02-97528 r_center_a, 12-02-13506 ofi_m RA, 12-02-33045 mol-a ved]
- Ministry of education and science of Russian Federation [8690]
- Federal Target Program 'Scientific, academic and teaching staff of innovative Russian Federation' [14.A18.21.0078]
- State task of Ministry of Education and Science of Russian Federation [2.3315.2011]
- President grant [14.125.13.2470-MK]
One-dimensional transverse (perpendicular to the laser polarization) gratings with periods Lambda approximate to 50-60 nm were observed on a titanium surface within 150 nm wide, micrometer-long regular surface modification longitudinal stripes fabricated by multiple 744 nm Ti:sapphire femtosecond laser shots, occurring at a repetition rate of 10 Hz. In the center of the surface laser spot these stripes are oriented strictly perpendicular to the laser polarization, in accordance with the plasmon-polaritonic model, and appear as ablative longitudinal trenches centered along the main stripe axes, which are precursors of longitudinal common ripples with a 500 nm period. At the low-fluence periphery of the laser spot, the stripes appear not as ablative longitudinal trenches, but as linear arrays of sub-ablative transverse nanoripples with periods down to 50 nm. The appearance of such superfine transverse nanoripples is related to incomplete spallation of the laser-molten surface layer, periodically modulated at the nanoscale through coherent sub-surface cavitation.
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