Mainz 2017 – scientific programme

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A: Fachverband Atomphysik

A 29: Ultrashort Laser Pulses: Generation and Applications (with Q)

A 29.9: Talk

Thursday, March 9, 2017, 16:30–16:45, P 5

Ultrafast laser fabrication of biomimetic micro and nano structured surfaces — •Evangelos Skoulas — N.Plastira 100, Heraclion, Greece

We report on the fabrication of artificial biomimetic surfaces fabricated via femtosecond laser processing. Metallic, semiconductor and dielectric surfaces were irradiated and Laser Induced Surface Structures (LIPSS) were observed in each type of material surface. In particular femtosecond laser pulses with linear, circular, radial and azimuthal polarization states were utilized for structuring steel (metallic), silicon (semiconductor) and fused silica (dielectrics) surfaces. Experimental results showed that the direction of LIPSS in each case proved to be polarization dependent. A complete study was carried out for the investigation and understanding of LIPSS dependence on fluence value and the number of pulses per spot at two different wavelengths of irradiation enabling the creation of new and more complex surface structures. Furthermore, different LIPSS morphologies and geometries were observed. Additionally large area surfaces were fabricated, tailored with various micro and nano structures bearing great structural resemblance with surfaces found in nature such as lotus leaf, shark skin and butterfly Greta Oto wing. Those bioinspired surfaces were found to exhibit remarkable optical and wetting properties which were attributed to the specific laser induced surface morphology. Thus femtosecond laser processing can be a novel and one single-step method for the fabrication of functional surfaces on almost all classes of solid materials.