Femtosecond-laser-induced nanostructure formed on nitrided stainless steel

• Published in: Applied surface science Vol. 264; pp. 611 - 615
• Main Authors: Yasumaru, Naoki, Sentoku, Eisuke, Miyazaki, Kenzo, Kiuchi, Junsuke
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.01.2013; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Femtosecond-laser ablation; Nanostructure; Nitriding; Physics; Stainless steel; Femtosecond-laser ablation; Nitriding; Nanostructure; Stainless steel; Laser radiation; Physical radiation effects; Nitridation; Laser ablation technique; Nanostructures; Stainless steels; Film growth
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2012.10.076

► Femtosecond-laser-induced periodic surface nanostructures formed on nitrided stainless steel were investigated. ► The mean spacing D in the nanostructure showed the minimum size of 250nm, corresponding to the size of ∼λ/3. ► The phenomenon where an irradiated area on the nitrided surface swells arose. ► D observed for the nitrided surface was 10–20% smaller than that for the untreated surface. Periodic surface nanostructures formed on nitrided stainless steel with femtosecond (fs) laser pulses were investigated and compared with those of an untreated surface. The nanostructures are formed in the direction perpendicular to the laser polarization, and the variation of the mean spacing D in the nanostructures was examined as a function of the laser fluence F and the shot number N of fs laser pulses. The minimum value of D observed at F around the ablation threshold was 250nm, which corresponds to approximately 1/3 of the laser wavelength λ, and D increased with increasing F. The characteristic phenomenon where an irradiated area on the nitrided surface swells was observed. The size of D formed over a broad area for the nitrided surface was 10–20% smaller than that for the untreated surface.