Optimization for high speed surface processing of metallic surfaces utilizing direct laser interference patterning

Abstract Direct laser interference patterning (DLIP) is a laser-based surface structuring method that stands out for its high throughput, flexibility and resolution for laboratory and industrial manufacturing. This top–down technique relies on the formation of an interference pattern by overlapping multiple laser beams onto the sample surface and thus producing a periodic texture by melting and/or ablating the material. Driven by the large industrial sectors, DLIP has been extensively used in the last decades to functionalize metallic surfaces, such as steel, aluminium, copper or nickel. Even so, DLIP processing of non-metallic materials has been gaining popularity in promising fields such as photonics, optoelectronics, nanotechnology and biomedicine. This review aims to comprehensively collect the main findings of DLIP structuring of polymers, ceramics, composites, semiconductors and other non-metals and outline their most relevant results. This contribution also presents the mechanisms by which laser radiation interacts with non-metallic materials in the DLIP process and summarizes the developed surface functions and their applications in different fields.

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In-Depth Investigation of Copper Surface Chemistry Modification by Ultrashort Pulsed Direct Laser Interference Patterning

Langmuir ◽

10.1021/acs.langmuir.0c01625 ◽

2020 ◽

Vol 36 (45) ◽

pp. 13415-13425 ◽

Cited By ~ 3

Author(s):

Daniel W. Müller ◽

Anne Holtsch ◽

Sarah Lößlein ◽

Christoph Pauly ◽

Christian Spengler ◽

...

Keyword(s):

Surface Chemistry ◽

Copper Surface ◽

Laser Interference ◽

Direct Laser ◽

Surface Chemistry Modification ◽

Direct Laser Interference Patterning

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Direct Laser Interference Patterning of Diffraction Gratings in Safrofilcon-A Hydrogel: Fabrication and Hydration Assessment

Polymers ◽

10.3390/polym13050679 ◽

2021 ◽

Vol 13 (5) ◽

pp. 679

Author(s):

Daniel Sola ◽

Stephan Milles ◽

Andrés F. Lasagni

Keyword(s):

Laser Fluence ◽

Contact Lenses ◽

Laser Source ◽

Spatial Period ◽

Laser Interference ◽

Periodic Patterns ◽

Hydration Properties ◽

Water Contact ◽

Direct Laser ◽

Direct Laser Interference Patterning

Refractive index modification by laser micro-structuration of diffractive optical devices in ophthalmic polymers has recently been applied for refractive correction in the fields of optics and ophthalmology. In this work, Safrofilcon-A hydrogel, used as soft contact lenses, was processed by direct laser interference patterning (DLIP) to fabricate linear periodic patterns on the surface of the samples. Periodic modulation of the surface was attained under two-beam interference by using a Q-switched laser source with emission at 263 nm and 4 ns pulse duration. Features of processed areas were studied as a function of both the interference spatial period and the laser fluence. Optical confocal microscopy used to evaluate the topography of the processed samples showed that both structured height and surface roughness increased with laser fluence. Static water contact angle (WCA) measurements were carried out with deionized water droplets on the structured areas to evaluate the hydration properties of DLIP structures. It was observed that the laser structured areas induced a delay in the hydration process. Finally, microstructural changes induced in the structured areas were assessed by confocal micro-Raman spectroscopy showing that at low laser fluences the polymer structure remained almost unaltered. In addition, Raman spectra of hydrated samples recovered the original shape of areas structured at low laser fluence.

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