High-speed manufacturing of highly regular femtosecond laser-induced periodic surface structures: physical origin of regularity.

ABSTRACT: Highly regular laser-induced periodic surface structures (HR-LIPSS) have been fabricated on surfaces of Mo, steel alloy and Ti at a record processing speed on large areas and with a record regularity in the obtained sub-wavelength structures. The physical mechanisms governing LIPSS regularity are identified and linked with the decay length (i.e. the mean free path) of the excited surface electromagnetic waves (SEWs). The dispersion of the LIPSS orientation angle well correlates with the SEWs decay length: the shorter this length, the more regular are the LIPSS. A material dependent criterion for obtaining HR-LIPSS is proposed for a large variety of metallic materials. It has been found that decreasing the spot size close to the SEW decay length is a key for covering several cm²

SUBMITTER: Gnilitskyi I 

PROVIDER: S-EPMC5559557 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature