Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10673249 | CIRP Annals - Manufacturing Technology | 2009 | 4 Pages |
Abstract
Laser induced self-organizing rippled nanostructures on steel are formed by femtosecond laser pulses. They are applied as hydrophobic surfaces. A low fluence results in 'regular ripples' with a spatial repetition of 300-500Â nm, orientated perpendicular to the laser polarization direction. In twinned areas 'pre-ripples' with much smaller wavelength (about 150Â nm) are observed, with a different orientation. We found indications that the energy absorption depends on the crystal orientation and that pre-ripples are only formed at very low fluence. Pre-ripples initiate on secondary carbides or on grain boundaries. At higher energy, regular ripples initiate in areas with pre-ripples; at even increasing fluence disordered structures are obtained.
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Authors
G.R.B.E. Römer, A.J. Huis in't Veld, J. Meijer, M.N.W. Groenendijk,