3D functional integration using radiation-based polymer modification and high-resolution polymer composite direct 3D printing

13:00 - 14:30
Dr.-Ing. Robert Kirchner
Head Mesoscopic 3D Systems, TU Dresden

Abstract Fully integrating functionalities like plasmonics or electronics into freeform 3D objects is challenging, given the available technologies, and especially when targeting industrial high-volume fabrication. We are developing solutions along two fundamentally different strategies. For the first, we start with planar structures and use out-of-plane rotation and translation to create compact and functional 3D objects. Such micro origami or kirigami techniques are the focus of academic research since a long time. They are of particular interest for us for 3D micro-nano-fabrication for MEMS, microfluidics, drug-delivery and smart-dust concepts. The major advantage is the usage of established planar lithography techniques. That means, the initial 2D structure can be fabricated with very high resolution, accurate placement, high-throughput and in a large set of different materials. I will discuss a new kirigami actuation concept deliberately controlling the viscoelastic creep and viscous reflow of linear thermoplastic polymers. I will shortly introduce our advanced surface patterning of 3D silica reliefs and of angle insensitive plasmonic structures for optically functional 3D objects. The second strategy focuses on sub-micrometer high-resolution 3D printing using multi-photon laser absorption. While the physical principle allows for lateral features below 100 nm, the variety of materials to be processed is limited for several reasons. I will present recent developments in modifying single-constituent materials based on spatially controlling the laser exposure. In addition, we are developing a new technology for efficient in-situ material replacement at the optical focus of the multi-photon laser writing system. That truly enables the route towards true freeform multi-material processing. The seminar is an overview on recent work to introduce our group and to look for potential mutual interests.

Letztmalig verändert: 09.03.2021, 00:10:43


TUD- 01069Dresden


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