One-step fabrication of asymmetric saw-tooth-like surface structures on stainless steel using Direct Laser Interference Patterning

• Published in: Materials letters Vol. 245; pp. 183 - 187
• Main Authors: Voisiat, Bogdan, Alamri, Sabri, Lasagni, Andrés F.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.06.2019; Elsevier BV
• Subjects: Direct Laser Interference Patterning; Inclination angle; Interference; Laser beams; Lasers; Materials science; Mathematical morphology; Non-symmetrical periodic structures; Saw-tooth geometry; Stainless steel; Stainless steels; Steel structures; Saw-tooth geometry; Direct Laser Interference Patterning; Non-symmetrical periodic structures
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2019.03.007

[Display omitted] •On-step fabrication of inclined structures on metals with micrometer resolution.•Inclination angle of the features is controlled by the titling angle of the sample.•The periodic structures show a well-defined saw-tooth morphology.•The saw-tooth pattern is also combined with low and high spatial frequency LIPSS. We report about the fabrication of asymmetrical periodic arrays on stainless steel by means of Direct Laser Interference Patterning. The fabrication strategy consists in irradiating the surface of the material under a certain inclination angle using a two-beam interference setup equipped with a pulsed picosecond laser system (70 ps) operating at a wavelength of 1064 nm. In particular, for tilting angles higher than 30°, well-defined saw-tooth like geometries could be produced. Due to the ultra-short duration of the laser pulses, also Laser Induced Periodic Surfaces Structures are fabricated, which create hierarchical morphologies similar to the one present in nature.