Multiple method micromachining laser platform for fabricating anti-counterfeit elements with multiple-scaled features

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

Abstract

Textured metallic parts with multiple-scaled micro-structures have significant advantages for anti-counterfeit applications. For this purpose, the development of an automatized micromachining laser-platform is introduced, which is capable of handling different laser based fabrication methods including direct laser writing (DLW) and direct laser interference patterning (DLIP), using only one laser source (Nd:YAG laser, 1064 nm wavelength, 500 ps pulse duration). Using DLW, line, cross-like and rectangular structures with length scales from 50 to 150 µm were produced, while DLIP was used to produce line-like patterns structures, with 3.7 and 25 µm spatial periods. In addition, laser induced periodic surface structures (LIPSS) were also combined and thus obtaining hierarchical patterns with three different length scales in one process. Finally, additional samples were automatically structured to produce examples of definable security features at the touch of a button. The surface topography of the treated samples is analyzed using scanning electron microscopy, optical microscopy and white light interferometry methods.

Details

Original languageEnglish
Pages (from-to)465-476
Number of pages12
JournalOptics and Laser Technology
Volume115
Publication statusPublished - Jul 2019
Peer-reviewedYes

External IDs

ORCID /0000-0003-4333-4636/work/196675549

Keywords

Keywords

  • Direct laser interference patterning, Direct laser writing, Hierarchical structures, Laser induced periodic surface structures, Micro structuring, Multiple-scaled structures