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High-Frequency Periodic Patterns Driven by Non-Radiative Fields Coupled with Marangoni Convection Instabilities on Laser-Excited Surfaces

20 Pages Posted: 6 Jan 2020 Publication Status: Accepted

See all articles by Anton Rudenko

Anton Rudenko

Université de Lyon - Laboratoire Hubert Curien

Anthony Abou-Saleh

Université de Lyon - Laboratoire Hubert Curien

Florent Pigeon

Université de Lyon - Laboratoire Hubert Curien

Cyril Mauclair

Université de Lyon - Laboratoire Hubert Curien

Florence Garrelie, Prof.

Université de Lyon - Laboratoire Hubert Curien

Razvan Stoian

University of Saint Etienne - Laboratoire Hubert Curien

Jean-Philippe Colombier

Université de Lyon - Laboratoire Hubert Curien

Abstract

The capability to organize matter in spontaneous periodic patterns under the action of light is critical in achieving laser structuring on sub-wavelength scales. Here, the phenomenon of light coupling to Marangoni convection flows is reported in an ultrashort laser-melted surface nanolayer destabilized by rarefaction wave resulting in the emergence of polarization-sensitive regular nanopatterns. Coupled electromagnetic and compressible Navier-Stokes simulations are performed in order to evidence that the transverse temperature gradients triggered by non-radiative optical response of surface topography are at the origin of Marangoni instability-driven self-organization of convection nanocells and high spatial frequency periodic structures onmetal surfaces, with dimensions down to λ/5 (lambda being the laser wavelength) given by Marangoni numberand melt layer thickness. The instability-driven organization of matter occurs in competition with electromagnetic feedback driven by material removal in positions of the strongest radiative field enhancement. Upon this feedback, surface topography evolves into low spatial frequency periodic structures, conserving the periodicity provided by light interference.

Keywords: Femtosecond Laser, Surface Nanostructuring, Self-organization, Marangoni instability, Compressible fluid dynamics

Suggested Citation

Rudenko, Anton and Abou-Saleh, Anthony and Pigeon, Florent and Mauclair, Cyril and Prof., Florence Garrelie, and Stoian, Razvan and Colombier, Jean-Philippe, High-Frequency Periodic Patterns Driven by Non-Radiative Fields Coupled with Marangoni Convection Instabilities on Laser-Excited Surfaces. Available at SSRN: https://ssrn.com/abstract=3509317 or http://dx.doi.org/10.2139/ssrn.3509317

Anton Rudenko (Contact Author)

Université de Lyon - Laboratoire Hubert Curien ( email )

St-Etienne, F-42023
France

Anthony Abou-Saleh

Université de Lyon - Laboratoire Hubert Curien ( email )

St-Etienne, F-42023
France

Florent Pigeon

Université de Lyon - Laboratoire Hubert Curien

St-Etienne, F-42023
France

Cyril Mauclair

Université de Lyon - Laboratoire Hubert Curien

St-Etienne, F-42023
France

Florence Garrelie, Prof.

Université de Lyon - Laboratoire Hubert Curien

St-Etienne, F-42023
France

Razvan Stoian

University of Saint Etienne - Laboratoire Hubert Curien

6, rue basse des rives
Saint Etienne, 42023
France

Jean-Philippe Colombier

Université de Lyon - Laboratoire Hubert Curien

St-Etienne, F-42023
France

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