An ultrafast laser assisted mesoscale lithography will be introduced by presenting its technological principles, current state-of-the-art and potential in 3D printing of diverse materials ranging from biocompatible, biodegradable and renewable organics to amorphous, ceramic and crystalline inorganics. Its applications towards prototyping and producing bio-medical implants, micro-optics and nano-photonics as well as creating micro-fluidic sensors will be shown. A special emphasis on the development and applications of microfabricated structures for life-sciences will be given, namely customization of laser direct write lithography-made 3D scaffolds for optimized in vivo outcome. Furthermore, the possibility to employ the technique for precision additive manufacturing out of plant-based resins and pure inorganics will be demonstrated. Finally, some unique functional properties of selected prototypes will be provided in detail validating their high efficiency performance.
Bio-based materials obtained from renewable sources are emerging as they offer easy processing, fulfill technological, functional and durability requirements at the same time ensuring increased bio-compatibility, recycling, and eventually lower cost. Optical 3D printing (O3DP) is a rapid prototyping tool (and an additive manufacturing technique) being developed as a choice for efficient and low waste production method, yet currently associated with mainly petroleum-derived resins. We employ a single bio-based resin derived from soybean oil, suitable for O3DP in the scales from nano- to macro-dimensions, which can be processed even without the addition of photoinitiator. The approach is validated using both state-of-the art laser nanolithography setup as well as a widespread table-top 3D printers - sub-micrometer accuracy 3D objects are fabricated reproducibly using Asiga platform. Such concept is a breakthrough in rapid prototyping by switching the focus of O3DP to bio-based resins.
In this talk we will present results on stimuli-responsive reversible deformations in polymeric microstructures fabricated using direct laser writing in pre-polymers (DLW-PP) technique. This microstructure behavior can be employed for micro-actuation applications in MEMS as well as designing new passive chemical sensors for microfluidic applications via hybrid (additive-subtractive) microfabrication technique. In this talk we will present our recent results in this field introducing few new concepts: a novel all-optical readout chemical sensor suitable for microfluidic applications, micromechanical components acting as flow control mechanisms based on bi-polymeric structures and solvent-sensitive micromechanical plug for microchannels.
In this work we reveal an influence of polarization of the laser beam on polymerization in direct laser writing. It was experimentally found that the width of suspended lines fabricated in SZ2080, OrmoComp and PETA (pentaerythritol triacrylate) pre-polymers directly depends on the incident polarization and is largest when the angle between the electric field vector and the sample translation direction is α = 90° and the smallest when α = 0°. The size of polymerized structures is consistent with theoretical simulations based on vectorial Debye theory. Experiments were performed by using average laser power corresponding to the middle value of the fabrication window. Polarization was found to be affecting feature sizes while structuring various widespread photoresists, the observed variation was material dependent and measured from 5 to 22% in the line-width. The performed study proves that polarization can be used as a variable parameter for fine tuning of the voxel's aspect ratio.
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