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Femtosecond laser writing of nanostructures on bulk Al via its ablation in air and liquids |
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| Authors: | E Stratakis V Zorba M Barberoglou C Fotakis GA Shafeev |
| Institution: | a Institute of Electronic Structure and Laser, Foundation for Research & Technology—Hellas (IESL-FORTH), PO Box 1527, Heraklion 711 10, Greece b Materials Science and Technology Department, University of Crete, Heraklion 710 03, Greece c Physics Department, University of Crete, Heraklion 714 09, Greece d Wave Research Center of A.M. Prokhorov General Physics Institute of the Russian Academy of Sciences, 38, Vavilov Street, 119991 Moscow, Russian Federation |
| Abstract: | We report on the formation of self-organized nanostructures (NS) on bulk Al under its ablation in air and liquids with femtoseconds (fs) laser pulses. In case of exposure into liquids, NS are regularly formed on the Al surface with an average period of about 200 nm, independent of the laser polarization. A dispersion of Al nanoparticles (NPs) into the liquid additionally occurs. Irregular nano-bumps are produced when the irradiation is performed in air. NP dispersions as well as NS formed on Al surface show a characteristic absorption peak in the near UV which has been attributed to plasmon oscillation of electrons. The wings of this peak extending to the visible, lead to a distinct yellow coloration of the processed Al surface and the liquid dispersions. Ultrafast laser processing of bulk Al in liquids may be potentially a promising technique for efficient production of nanosized aluminum. |
| Keywords: | Laser ablation Nanostructures Nanoparticles Aluminum Liquid |
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