Long-time feedback in self-organized nanostructures formation upon multipulse femtosecond laser ablation

Juergen Reif; Olga Varlamova; Mourad Bounhalli; Tzanimir Arguirov; Martin Schade; Hartmut S. Leipner

doi:10.1117/12.846978

26 February 2010 Long-time feedback in self-organized nanostructures formation upon multipulse femtosecond laser ablation

Juergen Reif, Olga Varlamova, Mourad Bounhalli, Tzanimir Arguirov, Martin Schade, Hartmut S. Leipner

Author Affiliations +

Proceedings Volume 7586, Synthesis and Photonics of Nanoscale Materials VII; 75860H (2010) https://doi.org/10.1117/12.846978
Event: SPIE LASE, 2010, San Francisco, California, United States

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.

Citation Download Citation

Juergen Reif, Olga Varlamova, Mourad Bounhalli, Tzanimir Arguirov, Martin Schade, and Hartmut S. Leipner "Long-time feedback in self-organized nanostructures formation upon multipulse femtosecond laser ablation", Proc. SPIE 7586, Synthesis and Photonics of Nanoscale Materials VII, 75860H (26 February 2010); https://doi.org/10.1117/12.846978

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