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Two-step absorption instead of two-photon absorption in 3D nanoprinting

The quadratic optical nonlinearity arising from two-photon absorption provides the crucial spatial concentration of optical excitation in three-dimensional (3D) laser nanoprinting, with widespread applications in technical and life sciences. Femtosecond lasers allow for obtaining efficient two-photo...

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Main Authors: Hahn, Vincent (Author) , Messer, Tobias (Author) , Bojanowski, N. Maximilian (Author) , Curticean, Ernest Ronald (Author) , Wacker, Irene (Author) , Schröder, Rasmus R. (Author) , Blasco, Eva (Author) , Wegener, Martin (Author)
Format: Article (Journal)
Language:English
Published: 29 November 2021
In: Nature photonics
Year: 2021, Volume: 15, Issue: 12, Pages: 932-938
ISSN:1749-4893
DOI:10.1038/s41566-021-00906-8
Online Access:Resolving-System, lizenzpflichtig, Volltext: https://doi.org/10.1038/s41566-021-00906-8
Verlag, lizenzpflichtig, Volltext: https://www.nature.com/articles/s41566-021-00906-8
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Author Notes:Vincent Hahn, Tobias Messer, N. Maximilian Bojanowski, Ernest Ronald Curticean, Irene Wacker, Rasmus R. Schröder, Eva Blasco and Martin Wegener
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Summary:The quadratic optical nonlinearity arising from two-photon absorption provides the crucial spatial concentration of optical excitation in three-dimensional (3D) laser nanoprinting, with widespread applications in technical and life sciences. Femtosecond lasers allow for obtaining efficient two-photon absorption but are accompanied by a number of issues, including higher-order processes, cost, reliability and size. Here we introduce two-step absorption replacing two-photon absorption as the primary optical excitation process. Under suitable conditions, two-step absorption shows the same quadratic optical nonlinearity as two-photon absorption. We present a photoresist system based on a photoinitiator supporting two-step absorption, a scavenger and a well-established triacrylate. We show that this system allows for printing state-of-the-art 3D nanostructures and beyond. In these experiments, we use ~100 μW optical power from an inexpensive, compact continuous-wave semiconductor laser diode emitting at 405 nm wavelength. Our work opens the door to drastic miniaturization and cost reduction of 3D laser nanoprinters.
Item Description:Gesehen am 01.12.2021
Physical Description:Online Resource
ISSN:1749-4893
DOI:10.1038/s41566-021-00906-8

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