Behavior of thin metallic films melted with a nanosecond laser pulse

J. Bischof; M. Reinmuth; Johannes Boneberg; Stephan Herminghaus; T. Palberg; Paul Leiderer

doi:10.1117/12.232207

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11 March 1996 Behavior of thin metallic films melted with a nanosecond laser pulse

J. Bischof, M. Reinmuth, Johannes Boneberg, Stephan Herminghaus, T. Palberg, Paul Leiderer

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Proceedings Volume 2777, ALT'95 International Symposium on Advanced Materials for Optics and Optoelectronics; (1996) https://doi.org/10.1117/12.232207
Event: ALT '95 International Conference: Advanced Materials for Optics and Optoelectronics, 1995, Prague, Czech Republic

Abstract

Thin metal films (Cu, Au, Ni) and thin Si films with different thicknesses on fused silica were irradiated with a ns-pulse from a Nd:YAG-laser (lambda equals 532 nm, FWHM 7 ns). In this paper we want to focus on the optical properties of an undercooled metallic liquid and the observed dewetting of the thin films. The ongoing processes were monitored in situ with ns- time-resolved reflectivity measurements. We determined the thresholds for partial and compete melting of these films. Due to the high cooling rates (up to 10¹¹ K/s) different 'frozen' stages of the dewetting phenomenon can be studied in detail with ex situ microscopic investigations, e.g. optical microscopy and scanning near field acoustic microscopy. We present measurements which show that we have observed spinodal dewetting of these thin films.

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J. Bischof, M. Reinmuth, Johannes Boneberg, Stephan Herminghaus, T. Palberg, and Paul Leiderer "Behavior of thin metallic films melted with a nanosecond laser pulse", Proc. SPIE 2777, ALT'95 International Symposium on Advanced Materials for Optics and Optoelectronics, (11 March 1996); https://doi.org/10.1117/12.232207

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