Observation of Single Ultra-short Laser Pulse Generated Periodic Surface Structures on Line-like Defects
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Date
2019-10Type
- Conference Paper
ETH Bibliography
yes
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Abstract
The formation of self-assembled laser induced periodic surface structures (LIPSS) after ultra-short pulsed laser ablation is still a matter of controversy in literature. It is agreed that there are at least two different physical driving forces depending on the spatial periodicity. High spatial frequency laser induced periodic surface structures (HSFL) with a periodicity well below the incident wavelength are discriminated from low spatial frequency structures (LSFL) revealing longer periodic structures. In general, both kind of LIPSS appear after multi-pulse irradiation with linear polarization direction on all material classes from metals to dielectrics. However, single-pulse induced LSFL at 540nm+/-35nm periodicity with sub picosecond pulse are observed at line-like surface defects, e.g. scratches. Depending on the difference in orientation between the electric field vector and the scratch direction, LIPSS evolve upon ablation with 515nm and 1ps pulses near the threshold. This corroborates the theory proposed by Sipe, where the impinging electromagnetic wave interacts with a collectively excited surface electron wave of the respective material at a surface defect. The observations on oxygen-free pure copper, zirconia and a stainless steel substrate are discussed. Show more
Publication status
publishedEditor
Book title
2019 ICALEO Conference ProceedingsPublisher
Laser Institute of AmericaEvent
Subject
Laser ablation; Laser induced periodic surface structures; ultra-short pulsed laser; Micro structuresOrganisational unit
03641 - Wegener, Konrad / Wegener, Konrad
Funding
169654 - Functional Surface Structuring for Innovative Tools - FuSSI tools (SNF)
Related publications and datasets
Is part of: http://hdl.handle.net/20.500.11850/417230
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