Micro- and nanostructuring of metal surfaces with polarized femtosecond laser pulses

Abstract

Abstract. Under irradiation of the surface of metals with femtosecond laser pulses, periodic surface micro-and nanostructures have been obtained. The dependence of orientation inherent to formed structures on direction of the electric field related with the incident electromagnetic wave and type of polarization of this wave has been studied. Typically these laser-induced structures are perpendicular to the electric field of incident light and have period shorter than the laser wavelength. The structures oriented in parallel to the polarization vector with a longer period have been also revealed. The dependence of surface structure formation on the initial surface defects in metal has been found.

From Femtosecond to Nanosecond Laser Microstructuring of Conical Aluminum Surfaces by Reactive Gas Assisted Laser Ablation

“…AlN decomposes upon contact with wet air and aqueous cleaning of the samples to aluminum hydroxide, which can explain the resulting oxygen content. As an interesting aspect, the typical periodic parallel lines induced by laser irradiation (laser induced periodic surface structures, LIPSS [37] ) have been detected with a periodicity of approx. 1 μm in the sample.…”

Conical microstructuring of titanium by reactive gas assisted laser texturing

“…The formation of self-organised microstructures by femtosecond laser structuring is a well-investigated and intensely discussed topic in laser structuring. 45–48 The laser induced periodic surface structures (LIPSS) are formed perpendicular to the polarization of the laser beam with a periodicity in the order of the laser beam or slightly below. With laser pulses on the picosecond timescale such parallel lines have been identified, too.…”