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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| Hauptverfasser: | , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
29 November 2021
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| In: |
Nature photonics
Year: 2021, Jahrgang: 15, Heft: 12, Pages: 932-938 |
| ISSN: | 1749-4893 |
| DOI: | 10.1038/s41566-021-00906-8 |
| Online-Zugang: | 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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| Verfasserangaben: | Vincent Hahn, Tobias Messer, N. Maximilian Bojanowski, Ernest Ronald Curticean, Irene Wacker, Rasmus R. Schröder, Eva Blasco and Martin Wegener |
| Zusammenfassung: | 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. |
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| Beschreibung: | Gesehen am 01.12.2021 |
| Beschreibung: | Online Resource |
| ISSN: | 1749-4893 |
| DOI: | 10.1038/s41566-021-00906-8 |