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Open AccessArticle

The Role of the Laser-Induced Oxide Layer in the Formation of Laser-Induced Periodic Surface Structures

1
Bundesanstalt für Materialforschung und -prüfung (B A M), Unter den Eichen 87, 12205 Berlin, Germany
2
Département de Physique, Université Laval, Pavillon Alexandre-Vachon 1045, Av. de la Médecine, Québec, QC G1V0A6, Canada
3
Laser Processing Group, Instituto de Óptica IO-CSIC, Serrano 121, 28006 Madrid, Spain
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(1), 147; https://doi.org/10.3390/nano10010147
Received: 6 December 2019 / Revised: 6 January 2020 / Accepted: 9 January 2020 / Published: 14 January 2020
(This article belongs to the Special Issue Laser-Generated Periodic Nanostructures)
Laser-induced periodic surface structures (LIPSS) are often present when processing solid targets with linearly polarized ultrashort laser pulses. The different irradiation parameters to produce them on metals, semiconductors and dielectrics have been studied extensively, identifying suitable regimes to tailor its properties for applications in the fields of optics, medicine, fluidics and tribology, to name a few. One important parameter widely present when exposing the samples to the high intensities provided by these laser pulses in air environment, that generally is not considered, is the formation of a superficial laser-induced oxide layer. In this paper, we fabricate LIPSS on a layer of the oxidation prone hard-coating material chromium nitride in order to investigate the impact of the laser-induced oxide layer on its formation. A variety of complementary surface analytic techniques were employed, revealing morphological, chemical and structural characteristics of well-known high-spatial frequency LIPSS (HSFL) together with a new type of low-spatial frequency LIPSS (LSFL) with an anomalous orientation parallel to the laser polarization. Based on this input, we performed finite-difference time-domain calculations considering a layered system resembling the geometry of the HSFL along with the presence of a laser-induced oxide layer. The simulations support a scenario that the new type of LSFL is formed at the interface between the laser-induced oxide layer and the non-altered material underneath. These findings suggest that LSFL structures parallel to the polarization can be easily induced in materials that are prone to oxidation. View Full-Text
Keywords: laser-induced oxide layer; laser-induced periodic surface structures; LIPSS; surface chemistry; nanostructuring; femtosecond laser processing laser-induced oxide layer; laser-induced periodic surface structures; LIPSS; surface chemistry; nanostructuring; femtosecond laser processing
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MDPI and ACS Style

Florian, C.; Déziel, J.-L.; Kirner, S.V.; Siegel, J.; Bonse, J. The Role of the Laser-Induced Oxide Layer in the Formation of Laser-Induced Periodic Surface Structures. Nanomaterials 2020, 10, 147.

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