On the formation of laser induced self-organizing nanostructures

Römer, G.R.B.E. and Huis in 't Veld, M.H.A. and Meijer, J. and Groenendijk, M.N.W. (2009) On the formation of laser induced self-organizing nanostructures. CIRP Annals, 58 (1). pp. 201-204. ISSN 0007-8506

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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 300–500 nm, orientated perpendicular to the laser polarization direction. In twinned areas ‘pre-ripples’ with much smaller wavelength (about 150 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.
Item Type:	Article
Copyright:	© 2009 Elsevier
Faculty:	Engineering Technology (CTW)
Research Group:	Mechanical Automation and Mechatronics
Link to this item:	http://purl.utwente.nl/publications/73038
Official URL:	http://dx.doi.org/10.1016/j.cirp.2009.03.068
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