Laser-driven high-frequency vibrations of metal blister surface
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Laser-driven high-frequency vibrations of metal blister surface T.V. Kononenko · M.N. Sinyavsky · V.I. Konov · M. Sentis
Received: 24 April 2013 / Accepted: 29 April 2013 / Published online: 21 May 2013 © Springer-Verlag Berlin Heidelberg 2013
Abstract Time-resolved interferometric microscopy was applied to investigate laser-induced blistering of a titanium film on a silica substrate. Ablation of the titanium/silica interface by single 0.7 ns pulses within a certain fluence range results in local exfoliation of the metal film from the substrate avoiding, however, complete film destruction. Timedependent transformation of the metal surface profile was reconstructed from the interference patterns within 0–13 ns time delay range. Transverse annular waves with typical amplitude of one hundred of nanometers and estimated traveling speed of few kilometers per second were revealed on the blister surface. The wave occurrence was attributed to fast inhomogeneous bending of the film covering the expanding blister. The resultant high-frequency (∼1 GHz) vibrations of the metal surface provide intensive inertial forces when such metalized target is used for blister-based laser-induced forward transfer of nanopowders and organic molecules.
1 Introduction The blister-based laser-induced forward transfer (BB-LIFT) technique was proposed recently for local deposition of nanopowder [1] and organic molecules [2]. Main advantages of the BB-LIFT procedure comparing with other known LIFT methods [3] is applicability for liquid-free substances, no contamination of the transferred material by ablation T.V. Kononenko () · M.N. Sinyavsky · V.I. Konov Natural Sciences Center of General Physics Institute, Vavilov str. 38, 119991, Moscow, Russia e-mail: [email protected] M. Sentis LP3 Université Aix-Marseille II, Luminy, Case 917, 13288 Marseille Cedex 9, France
products and low heating of the transferred material [4, 5]. The material meant for transfer is spread over the surface of a thin metal film deposited on a transparent support. Laser irradiation of the film through the support under optimized conditions allows ejection of the covering material away of the target without the film destruction. It is supposed that the material ejection is driven by inertial forces generated under transient deformation of the metal surface. If the laser fluence is high enough to cause metal evaporation and local exfoliation of the film from the support, the produced permanent blister can be detected under post-process microscopic investigation of the target. Efficient material ejection is possible also below the metal evaporation threshold (i.e. without formation of the permanent blister), presumably, due to laser-induced thermal expansion of the metal film. It seems evident that deep understanding of features of the BB-LIFT process is impossible without exhaustive information on the laser-driven motion of the metal surface. Time-dependent displacement of the metalized surface of the target irradiated from the rear side was repeatedly studied a
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