direct laser writing
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2022 ◽  
Vol 34 (1) ◽  
pp. 012007
Author(s):  
Lisa Zeußel ◽  
Jörg Hampl ◽  
Frank Weise ◽  
Sukhdeep Singh ◽  
Andreas Schober

2021 ◽  
pp. 2109446
Author(s):  
Xingyu Wu ◽  
Bryan Gross ◽  
Benjamin Leuschel ◽  
Karine Mougin ◽  
Sébastien Dominici ◽  
...  

2021 ◽  
Author(s):  
Mihajlo D Radmilović ◽  
Branka D. Murić ◽  
Dušan Gujić ◽  
Boban Zarkov ◽  
Marija Z. Nenadić ◽  
...  

Abstract Microoptical components are coming of age in a wide range of applications: lab-on-a-chip, imaging, detection... There are a large number of fabrication technologies capable of producing high quality individual components and their arrays. However, most of them require high-end and costly equipment, complex and time-consuming fabrication, harmful chemicals, resulting in expensive final products. Here we present a technology capable of producing high quality microoptical components, using low-end direct laser writing on a biocompatible, environmentally friendly hydrogel, without any waste substances. Gel is locally and controllably melted while surface tension forces shape the optical component, following the laser beam profile. Process is so quick that a single microlens is fabricated in less than a second, and can be used instantly without any further processing. The technology is neither subtractive nor additive, and the base material is simply displaced producing a smooth surface. We have been able to fabricate individual microlenses and their arrays (positive, negative, aspheric), gratings and diffractive components. The technology is tested by generating unique, difficult to counterfeit QR-codes. Turnaround time is fast and makes the technology suitable both for rapid prototyping and serial production.


2021 ◽  
Author(s):  
Yutong Wang ◽  
Chunrui Han ◽  
Yi Zhou ◽  
Changjun Ke ◽  
Yu Wang

2021 ◽  
Vol 1 ◽  
pp. 129
Author(s):  
Marco Carlotti ◽  
Omar Tricinci ◽  
Frank den Hoed ◽  
Stefano Palagi ◽  
Virgilio Mattoli

Background: The ability to fabricate components capable of performing actuation in a reliable and controlled manner is one of the main research topics in the field of microelectromechanical systems (MEMS). However, the development of these technologies can be limited in many cases by 2D lithographic techniques employed in the fabrication process. Direct Laser Writing (DLW), a 3D microprinting technique based on two-photon polymerization, can offer novel solutions to prepare, both rapidly and reliably, 3D nano- and microstructures of arbitrary complexity. In addition, the use of functional materials in the printing process can result in the fabrication of smart and responsive devices. Methods: In this study, we present a novel methodology for the printing of 3D actuating microelements comprising Liquid Crystal Elastomers (LCEs) obtained by DLW. The alignment of the mesogens was performed using a static electric field (1.7 V/µm) generated by indium-tin oxide (ITO) electrodes patterned directly on the printing substrates. Results: When exposed to a temperature higher than 50°C, the printed microstructures actuated rapidly and reversibly of about 8% in the direction perpendicular to the director. Conclusions: A novel methodology was developed that allows the printing of directional actuators comprising LCEs via DLW. To impart the necessary alignment of the mesogens, a static electric field was applied before the printing process by making use of flat ITO electrodes present on the printing substrates. The resulting microelements showed a reversible change in shape when heated higher than 50 °C.


2021 ◽  
pp. 2100158
Author(s):  
Marc del Pozo ◽  
Colm Delaney ◽  
Marina Pilz da Cunha ◽  
Michael G. Debije ◽  
Larisa Florea ◽  
...  

2021 ◽  
Author(s):  
Andreas Hoffmann ◽  
Pablo Jiménez-Calvo ◽  
Volker Strauss ◽  
Alexander Kühne

We report carbonization of polyacrylonitrile by direct laser writing to produce microsupercapacitors directly on-chip. We demonstrate the process by producing interdigitated carbon finger electrodes directly on a printed circuit board, which we then employ to characterize our supercapacitor electrodes. By varying the laser power, we are able to tune the process from carbonization to material ablation. This allows to not only convert pristine polyacrylonitrile films into carbon electrodes, but also to pattern and cut away non-carbonized material to produce completely freestanding carbon electrodes. While the carbon electrodes adhere well to the printed circuit board, non-carbonized polyacrylonitrile is peeled off the substrate. We achieve specific capacities as high as 260 µF/cm2 in a supercapacitor with 16 fingers.


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