Self-organization in a chromium thin film under laser irradiation |
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Authors: | M Gedvilas G Ra?iukaitis K Regelskis |
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Institution: | (1) Laboratory for Applied Research, Institute of Physics, Savanorių Ave. 231, 02300 Vilnius, Lithuania |
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Abstract: | Self-organization of chromium on glass was observed during laser ablation of the metal film with partially overlapping laser
pulses. The beam of a nanosecond pulse laser tightly focused to a line was applied to the back-side ablation of the chromium
thin film on a glass substrate. While the line ablated with a single laser pulse had sharp edges on both sides with ridges
of the melted metal, the use of partially overlapping pulses formed a complicated structure made of the metal remaining from
the ridges. Regular structures of ripples were developed in a certain range of laser fluence and pulse overlap. The ripple
period could be controlled from 2.5 to 4 μm by variation of the processing parameters. Various experimental techniques were
applied to test the structures, and different models of the ripple formation in the thin metal film were considered. The initial
quasi-periodical formation started because of dewetting of thin liquid metal films on the glass substrate after its melting.
Similar to the evaporation of liquid films, the small perturbation in the ridge thickness was able to induce instability in
evaporation of the thin melted metal film. Freezing of the nonequilibrium state between laser pulses was one of the stabilizing
factors in self-organization of the metal. |
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Keywords: | PACS" target="_blank">PACS 47 20 Dr 68 55 Ac 89 20 Bb 42 62 Cf |
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