Formation of nanofibers and microspheres by femtosecond laser ablation of chalcogenide glass

O. A. Louchev; S. Juodkazis; H. Misawa; K. Kitamura

doi:10.1117/12.751936

17 July 2007 Formation of nanofibers and microspheres by femtosecond laser ablation of chalcogenide glasse

O. A. Louchev, S. Juodkazis, H. Misawa, K. Kitamura

Proceedings Volume 6732, International Conference on Lasers, Applications, and Technologies 2007: Laser-assisted Micro- and Nanotechnologies; 673210 (2007) https://doi.org/10.1117/12.751936
Event: International Conference on Lasers, Applications, and Technologies '07, 2007, Minsk, Belarus

Abstract

Formation of nano-fibers ranging from 30 to 300 nm in diameter and exceeding the length of one millimeter was observed during explosive ablation of As₂S₃ glass by femtosecond pulses at high fluence (> 5 J/cm²) irradiation of the 800 nm wavelength, 160 fs duration pulses in air. However, the spheres of up to several microns in diameter are found to form competing with nano-fiber formation and significantly deteriorating their morphology. The formation of these spheres is explained by the free energy minimization of explosively ablating liquid jets combined with the onset and evolution of the thermo-capillary forces at the local perturbations of the geometry and temperature. Performed thermal analysis suggests that the good nano-fiber morphology can be preserved by increasing the air pressure or ablation in water which shortens the characteristic cooling and solidification time of the liquid jets, and inhibits the development of the small geometrical perturbations into the large spheres.

Citation Download Citation

O. A. Louchev, S. Juodkazis, H. Misawa, and K. Kitamura "Formation of nanofibers and microspheres by femtosecond laser ablation of chalcogenide glasse", Proc. SPIE 6732, International Conference on Lasers, Applications, and Technologies 2007: Laser-assisted Micro- and Nanotechnologies, 673210 (17 July 2007); https://doi.org/10.1117/12.751936

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KEYWORDS

Liquids

Laser ablation

Solids

Optical spheres

Spherical lenses

Optical fibers

Capillaries

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