Femtosecond laser processing of NiPd single and 5x(Ni/Pd) multilayer thin films
| Autor: | Davor Peruško, S. Zdravković, Ion N. Mihailescu, Marian Zamfirescu, C. Radu, C.L. Luculescu, Carmen Ristoscu, Bojan B. Radak, Suzana Petrović, Biljana M. Gaković |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Periodic structures Laser processing General Physics and Astronomy 02 engineering and technology Surface finish 01 natural sciences law.invention Optics law 0103 physical sciences Surface roughness Thin film 010302 applied physics business.industry Pulse duration Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Laser Surfaces Coatings and Films Wavelength Femtosecond Sapphire Optoelectronics 0210 nano-technology business |
| Zdroj: | Applied Surface Science |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2016.12.142 |
| Popis: | Modification of single and complex nickel-palladium samples by laser processing in the femtosecond time domain was studied. The samples were processed by focused Ti:Sapphire laser beam (Clark CPA-2101) with 775 nm laser wavelength, 2 kHz repetition rate, 200 fs pulse duration. The laser-induced morphological modifications have shown dependence on the applied fluences and number of laser pulses. The formed surface nanostructures on the single NiPd/Si and multilayer 5x(Ni/Pd)/Si systems are compared with individual Ni and Pd thin films. The results show an increase in surface roughness, formation of parallel periodic surface structures, appearance of hydrodynamic features and ablation of surface material. At low number of pulses (less than 10 pulses) and low pulse energies range (not over 1.7 mu J), the two types of laser-induced periodic surface structure (LIPSS) can be observed: low and high spatial frequency LIPSS (HSFL and LSFL). For all samples, the measured LSFL periods were 720 nm for the ripples created solely on thin film surfaces during the single pulse action. In the case of the multi-pulse irradiation, the periodicities of created LSFLs on the all investigated thin films have shown tendency to reduction with increasing of pulse energies. (C) 2016 Elsevier B.V. All rights reserved. 10th International Conference on Photo-Excited Processes and Applications (ICPEPA), Aug 29-Sep 02, 2016, Transilvania Univ Brasov, Brasov, Romania |
| Databáze: | OpenAIRE |
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