Nano- and femtosecond laser coloring methods and their investigation using scanning electron microscopy and X-ray photoelectron spectroscopy
1University of Oulu, Faculty of Science, Physics
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Oulu : L. Keränen,
Color production by lasers is created when micro- to nanometer sized structures are created on the surface of matter. These structures are the result of interference with light or intrinsic color of new compounds formed on a surface. The basics of atom physics and the understanding of interaction of matter with radiation through photoemission, Auger emission and x-ray production are introduced. Then, mechanically polished AISI 304 and 301 LN slabs were picked for nanosecond and femtosecond laser treatment. The structure on the surface was studied through X-ray Photoelectron Spectroscopy (XPS) ans Scanning Electron Microscopy (SEM). The results show that the source of color was different in the case of nanosecond treated surface compared to the femtosecond treated surface. With nanosecond color coming from the intrinsic color of oxide layers formed and with femtosecond color coming from the structure interfering with light. It is clear that the research in the field will continue because of the potential of cheap and environmentally friendly way of producing color.
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