Dr. Iaroslav Gnilitskyi Profile

Dr. Iaroslav Gnilitskyi

at Univ degli Studi di Modena e Reggio Emilia

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Proceedings Article | 4 March 2019 Presentation

Highly regular LIPSS: Physical considerations and industrial applications (Conference Presentation)

Leonardo Orazi, Iaroslav Gnilitskyi, Nadezha Bulgakova, Tomáš Mocek

Proceedings Volume 10906, 1090610 (2019) https://doi.org/10.1117/12.2515553

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In the last years LIPSS based processes leap from the research laboratories to industrial applications, in particular for tribology, polymer mold texturing, colorizing and enhanced biocompatibility. Despite of these applications not all the phenomena underlying LIPSS generation were understood and a comprehensive model to explain all the cases is generally accepted. In this work a phenomenological explanation of the level of regularity achievable when patterning different materials is proposed and discussed. In particular the regularity is correlated to the ratio between the laser wavelength and the decay length of the surface electromagnetic waves induced on the metallic surfaces. Regularity is measured by means of an original parameter, the Dispersion of the LIPSS Orientation Angle (DLOA). DLOA is calculated for different materials and parameters obtained both from original experiments and from literature and the results are the basis of the phenomenological model presented in the work. In the model the effects of the material dielectric permittivity and its dependency by time immediately after the irradiation are simulated and the effects of spot size is critically discussed.

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