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Plasmonic and Hydrodynamic Effects in Ultrafast Laser-Induced Periodic Surface Structures on Metals.

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Title: Plasmonic and Hydrodynamic Effects in Ultrafast Laser-Induced Periodic Surface Structures on Metals.
Authors: Colombier, J. P.1 Jean.philippe.colombier@univ-st-etienne.fr, Garrelie, F.1, Brunet, P.2, Bruyère, A.1, Pigeon, F.1, Stoian, R.1, Parriaux, O.1
Source: Journal of Laser Micro / Nanoengineering. Nov2012, Vol. 7 Issue 3, p362-368. 7p.
Subjects: Surface structure, Metal analysis, Ultrashort laser pulses, Plasmonics, Femtosecond lasers
Abstract: We report results on the development of laser-induced periodic surface structures produced by ultrashort laser pulses irradiating metallic surfaces. The surface topology features are discussed in terms of periodicity and amplitude contrast of the pattern formation, and in relation to the chronological sequence of laser-induced events. Resonant excitation of Surface Plasmons in metallic gratings show that the surface wave excited during the femtosecond laser pulse can initiate the observed patterning. Metallic behavior under nonequilibrium conditions on the picosecond timescale is then investigated to correlate the amount of material experiencing solid-to-liquid transitions and the subsequent structure amplitude. With the derived observation, the calculation of the transient nonequilibrium thermodynamic characteristics of excited nickel is performed, allowing to define characteristic timescales of thermocapillary processes which may occur under multi-pulse irradiation. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:We report results on the development of laser-induced periodic surface structures produced by ultrashort laser pulses irradiating metallic surfaces. The surface topology features are discussed in terms of periodicity and amplitude contrast of the pattern formation, and in relation to the chronological sequence of laser-induced events. Resonant excitation of Surface Plasmons in metallic gratings show that the surface wave excited during the femtosecond laser pulse can initiate the observed patterning. Metallic behavior under nonequilibrium conditions on the picosecond timescale is then investigated to correlate the amount of material experiencing solid-to-liquid transitions and the subsequent structure amplitude. With the derived observation, the calculation of the transient nonequilibrium thermodynamic characteristics of excited nickel is performed, allowing to define characteristic timescales of thermocapillary processes which may occur under multi-pulse irradiation. [ABSTRACT FROM AUTHOR]
ISSN:18800688
DOI:10.2961/jlmn.2012.03.0023