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Identifier	000403400
Title	Femtosecond laser structuring of metallic and dielectric surfaces with linear,radial and tangential polarization states
Alternative Title	Κατεργασία μεταλικών και διηλεκτρικών επιφανειών με γραμμικά ακτινικά και εφαπτομενικά πολωμένους υπερβραχείς παλμούς λέϊζερ
Author	Σκουλάς, Ευάγγελος
Thesis advisor	Στρατάκης, Εμμανουήλ Παπάζογλου, Δημήτριος
Abstract	The aim of this thesis is the experimental investigation of structuring of metallic and dielectric surfaces with radially and azimuthally polarized femtosecond laser pulses, in order to achieve controllable surface modification. In particular, Gaussian and Cylindrical vector beams, (CV) beams with the corresponding linear, radial and azimuthal polarization states were utilized for the fabrication of Laser Induced Surface Structures (LIPSS) on Nickel (Ni) and Fused Silica (SiO2) surfaces. Accordingly, LIPSS characteristics were evaluated as a function of the beam electric field state, fluence and number of pulses. The exploitation of variable polarization states in both dynamic and static surface processing schemes gave rise to the realization of new and more complex surface structures that could be used to fabricate functional surfaces with remarkable optical and wetting properties. Experimental results on Nickel surfaces showed that line-scanning with CV beams can be a novel strategy for the creation of multi-directional surface structures. Besides this, it is shown that surface processing with CV beams can be an important tool for fabricating at single-step-process a) hierarchical surface structures, with controllable micro and nano periodicity and enhanced superhydrophobic properties, b) complex multi-directional biomimetic structures inspired by the Shark’s skin. Finally, results on fused silica surfaces additionally showed supra-wavelength, low spatial frequency LIPSS with characteristics dependent on fluence and photon energy values.
Language	English
Issue date	2016-12-13
Collection	School/Department--School of Medicine--Department of Medicine--Post-graduate theses
	Type of Work--Post-graduate theses
Permanent Link	https://elocus.lib.uoc.gr//dlib/2/4/d/metadata-dlib-1482493342-609520-10347.tkl
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