Stephan Gräf is a researcher and working group leader at the Otto Schott Institute for Materials Research at the Friedrich Schiller University in Jena. He received his PhD in 2010 from the Friedrich Schiller University Jena in the field of laser welding with dynamically polarised CO2 laser radiation. Within the past years his work mainly focused on the engineering of material surfaces with tailored functional properties. This includes the detailed study of laser-matter interaction with regard to different wavelengths and pulse durations as well as laser-assisted micro- and nanostructuring of surfaces, particularly the fabrication of laser-induced periodic surface structures using ultrashort pulsed laser radiation.
The use of ultra-short pulsed lasers enables the fabrication of laser-induced periodic surface structures (LIPSS) on various materials following a single-step, direct-writing technique. These specific, well-ordered nanostructures with periodicities in the order of the utilised laser wavelength facilitate the engineering of surfaces with functional properties. This review paper discusses the physical background of LIPSS formation on substrates with different material properties. Using the examples of structural colours, specific wetting states and the reduction of friction and wear, this work presents experimental approaches that allow to deliberately influence the LIPSS formation process and thus tailor the surface properties. Finally, the review concludes with some future developments and perspectives related to forthcoming applications of LIPSS-based surfaces are discussed.
Advanced Optical Technologies is a strictly peer-reviewed scientific journal. The major aim of Advanced Optical Technologies is to publish recent progress in the fields of optical design, optical engineering, and optical manufacturing. Advanced Optical Technologies has a main focus on applied research and addresses scientists as well as experts in industrial research and development.