Femtosecond laser-induced periodic surface nanostructuring of sputtered platinum thin films

• Published in: Applied surface science 2015-10, Vol.351, p.135-139
• Main Authors: Rodríguez, Ainara, Morant-Miñana, Maria Carmen, Dias-Ponte, Antonio, Martínez-Calderón, Miguel, Gómez-Aranzadi, Mikel, Olaizola, Santiago M.
• Format: Article
• Language: English
• Subjects: 2D-FFT; Femtosecond; Femtosecond laser; Fourier transforms; Irradiation; Lasers; LIPSS; Nanostructure; Platinum; Scanning electron microscopy; Thin film; Thin films
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2015.05.117

•Femtosecond laser-induced surface nanostructures on sputtered platinum thin films.•Three types of structures obtained: random nanostructures, LSFL and HSFL.•Two different modification regimes have been established based on laser fluence. In this work, submicro and nanostructures self-formed on the surface of Platinum thin films under femtosecond laser-pulse irradiation are investigated. A Ti:Sapphire laser system was used to linearly scan 15mm lines with 100fs pulses at a central wavelength of 800nm with a 1kHz repetition rate. The resulting structures were characterized by scanning electron microscopy (SEM) and 2D-Fast Fourier Transform (2D-FFT) analysis. This analysis of images revealed different types of structures depending on the laser irradiation parameters: random nanostructures, low spatial frequency LIPSS (LSFL) with a periodicity from about 450 to 600nm, and high spatial frequency LIPSS (HSFL) with a periodicity from about 80 to 200nm. Two different modifications regimes have been established for the formation of nanostructures: (a) a high-fluence regime in which random nanostructures and LSFL are obtained and (b) a low-fluence regime in which HSFL and LSFL are obtained.