Jena 2013 – wissenschaftliches Programm

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K: Fachverband Kurzzeitphysik

K 8: Laseranwendungen und Lasermaterialbearbeitung II

K 8.1: Vortrag

Donnerstag, 28. Februar 2013, 14:00–14:15, HS 4

Laser induced periodic surface structures in thin metal foils — •Hamza Messaoudi, Susanta Kumar Das, Alexander Andreev, Matthias Schnuerer, and Ruediger Grunwald — Max Born Institute for Nonlinear Optics and Short-Pulse Spectroscopy, Max-Born-Str 2a, D-12489 Berlin, Germany

Femtosecond-laser induced periodic nanostructures were generated at the surface of extremely thin metal foils with the moving substrate method [1] in air. 5 micron thick Cu and Ti specimen were translated through a linear or point-like focus of a linearly polarized and frequency-converted femtosecond laser (pulse duration 120 fs, center wavelength 400 nm). It was found that two different types of ripple structures with high and low spatial frequencies corresponding to periods in the range of 70 nm and 300 nm, respectively, can be formed. The ripple type can be adjusted by confining the number and energy of the pulses and the scanning velocity. Between the distinct parameter fields of stable formation, a transition range with partially changing ripple size and orientation appears. The nanostructured foils are of interest for laser ion acceleration in transmission mode [2]. Because of enabling an easy conversion to metal oxides and favoring material-saving approaches, these structured foils are also promising candidates for flexible solar cells and innovative approaches of photocatalysts.

References:

1. S. K. Das, et al., Nanotechnology 21, 155302 (2010).

2. A. Andreev, et al., Physics of Plasmas 18, 103103 (2011).