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Proceedings Paper

Long-time feedback in self-organized nanostructures formation upon multipulse femtosecond laser ablation
Author(s): Juergen Reif; Olga Varlamova; Mourad Bounhalli; Tzanimir Arguirov; Martin Schade; Hartmut S. Leipner
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Paper Abstract

Self-organized nanostructures (ripples) on the target surface after multi-pulse femtosecond laser ablation exhibit, obviously, a positive multi-pulse feedback in the self-organization process. Experiments on different targets (CaF2, Si) investigate this feedback in more detail, in particular its dynamics. The influence of pulse number and time separation between successive pulses on both the size and the complexity of the nanostructures as well as the size of the modified surface area is studied. In addition to a dependence on the coupled dose, confirming incubation effects previously observed on ablation efficiency, both modified area as well as pattern feature size and complexity decrease with increasing pulse-to- pulse delay between 1 ms and 1 s, indicating an unexpectedly long lifetime of the feedback. Further, for silicon, a persisting modification of the crystalline structure is found well beyond the ablation spot, though no apparent change in surface morphology can be seen. Mapping the band-to-band photoluminescence displays a spatially modulated dramatic increase of non-radiative recombination compared to unaffected material.

Paper Details

Date Published: 26 February 2010
PDF: 9 pages
Proc. SPIE 7586, Synthesis and Photonics of Nanoscale Materials VII, 75860H (26 February 2010); doi: 10.1117/12.846978
Show Author Affiliations
Juergen Reif, Brandenburgische Technische Univ. Cottbus (Germany)
Cottbus Joint Lab. (Germany)
Olga Varlamova, Brandenburgische Technische Univ. Cottbus (Germany)
Cottbus Joint Lab. (Germany)
Mourad Bounhalli, Brandenburgische Technische Univ. Cottbus (Germany)
Univ. Jean Monnet Saint-Etienne (France)
Tzanimir Arguirov, Cottbus Joint Lab. (Germany)
Innovations for High-Performance Microelectronics GmbH (Germany)
Martin Schade, Martin-Luther-Univ. Halle-Wittenberg (Germany)
Hartmut S. Leipner, Martin-Luther-Univ. Halle-Wittenberg (Germany)

Published in SPIE Proceedings Vol. 7586:
Synthesis and Photonics of Nanoscale Materials VII
Jan J. Dubowski; David B. Geohegan; Frank Träger, Editor(s)

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