Model based optimization of process parameters to produce large homogeneous areas of laser-induced periodic surface structures

Results of the work in the Laser4Fun project has been published as:

Marek Mezera and G.R.B.E. Römer. Model based optimization of process parameters to produce large homogeneous areas of laser-induced periodic surface structures, Opt. Express 27, 6012-6029 (2019); doi: 10.1364/OE.27.006012

Abstract

A model is presented, which allows to predict the (in)homogeneity of large areas covered with Laser-induced Periodic Surface Structures (LIPSS), based on the laser processing parameters (peak laser fluence and geometrical pulse-to-pulse overlap) and experimentally determined material properties. As such, the model allows to establish optimal processing conditions, given the material properties of the substrate to be processed. The model is experimentally validated over a large range of geometrical pulse-to-pulse overlap values and fluence levels on silicon using a picosecond laser source.

Links:

DOI: 10.1364/OE.27.006012

PhD degree awarded to Fotis Fraggelakis

On February 14th, Fotis Fraggelakis successfully defended his thesis and was awarded the degree of PhD.

The now dr. Fraggelakis, was an Early Stage Researcher (ESR) of the Laser4Fun project. He was the the first PhD-candidate from the project to defend his PhD-thesis. The public defense ceremony took place on February 14th  at the Institute d’Optique d’Aquitaine (IOA) in Talence (France). He was supervised by dr. Inka Manek-Hönninger and dr. John Lopez of the University of Bordeaux, carried out most of his work at Alphanov under the supervision of dr. Rainer Kling of Alphanov, amongst others.

The PhD-defense committee consisted, among others, dr. Jörn Bonse of the Bundesanstalt für Materialforschung und -prüfung (BAM) in Berlin (Germany), prof. Antonio Ancona of the Consiglio Nazionale delle Ricerche (CNR), Istituto di Fotonica (IFN) of the University of Bari (Italy), and prof. Gert-willem Römer of the Chair of Laser Processing of the University of Twente (The Netherlands).

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PhD defense ceremony Fotis Fraggelakis on Feb. 14th 2019

fotis.fraggelakisFotis Fraggelakis, an Early Stage Researcher (ESR), will be the first PhD-candidate from the Laser4Fun project to defend his PhD-thesis. The public defense ceremony will take place on February 14th , 2019 at 9:30 am, in The amphitheater of IOA, the Institute d’Optique d’Aquitaine (IOA) at the Rue François Mitterrand 33400 Talence (France). Supervised by dr. Inka Manek-Hönninger and dr. John Lopez of the University of Bordeaux, carried out most of his work at Alphanov under the supervision of dr. Rainer Kling of Alphanov, amongst others. Below is an English and French summary of the work and results of Fotis.

English summary

Current industrial markets demand highly value-added products offering new features at a low-cost. Among the most desired functionalities are, surface colouring and blackenning, anti-icing, anti-biofouling, wear reduction and anti-reflectivity. Functional textures found in nature indicate that those properties can be enable by textures in the micro and nanoscale. Laser surface processing holds a virtually endless potential in mimicking bio inspired textures by modifying surface morphology and chemistry. We investigate several techniques to achieve controlled laser structuring in the submicron regime such as polarization control and double pulse irradiation. Valuable data were provided both in the surface functionalization, in understanding and controlling of laser induced structuring and in upscaling a lab developed process. We believe that our results open the way for laser texturing exploitation in everyday applications exploiting up to date laser sources and positioning systems.

French summary

L’Industrie actuelle demande des produits à haute valeur ajoutée offrant des nouvelles fonctions à moindre coût telles que la coloration ou le noircissement de surface, la réduction des frottements, la génération de surface antiréflexion, antibactérienne, superhydrophobe ou anti-icing. Les surfaces fonctionnelles présentes dans la nature nous indiquent que ces propriétés uniques ne sont possibles par des texturations de surface à l’échelle micro et nanométrique adéquates. La technologie laser révolutionne le champ des possibles et permet de reproduire ces fonctions inspirées du monde du vivant en modifiant la morphologie et la chimie de surface. Nous avons étudié plusieurs techniques de texturation de surface par laser femtoseconde en jouant sur la polarisation et l’irradiation en double impulsion. Ces travaux de recherche apportent une contribution significative dans la compréhension des mécanismes et dans la capacité à produire de telles texturations sur des grandes surfaces