December 2, 14:00-15:30
3D laser nanoprinting: Faster, smaller, more, and more economic
Prof Dr Martin Wegener, Karlsruher Institut für Technologie
In this talk, I shall give an introduction into three-dimensional (3D) laser nanoprinting based on two-photon-absorption and review the corresponding state-of-the-art. Examples are given. Furthermore, I shall present recent progress of my research group regarding obtaining finer features, faster and scalable 3D printing, and printing of dissimilar materials in one 3D structure. In addition, I shall present the idea of using two-step absorption instead of two-photon absorption. For two-photon absorption, bulky and expensive femtosecond lasers are necessary, whereas compact, low-power, inexpensive continuous-wave lasers suffice for (degenerate) two-step absorption (i.e., two sequential one-photon absorption processes). The non-degenerate version of two-step absorption enables parallelized light-sheet 3D laser printing with two different continuous-wave lasers with different colors.
After completing his Diplom and PhD in physics at Johann Wolfgang Goethe-Universität Frankfurt (Germany) in 1986 and 1987, respectively, he spent two years as a postdoc at AT&T Bell Laboratories in Holmdel (U.S.A.). From 1990-1995 he was professor (C3) at Universität Dortmund (Germany), since 1995 he is professor (C4, later W3) at Institute of Applied Physics of Karlsruhe Institute of Technology (KIT). Since 2001 he has a joint appointment as department head at Institute of Nanotechnology (INT) of KIT, since 2016 he is one of three directors at INT. From 2001-2014 he was the coordinator of the DFG-Center for Functional Nanostructures (CFN) at KIT. Since 2018 he is spokesperson of the Cluster of Excellence 3D Matter Made to Order. His research interests comprise ultrafast optics, (extreme) nonlinear optics, optical laser lithography, photonic crystals, optical, mechanical, electronic, and thermodynamic metamaterials, as well as transformation physics.