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

Autor: Tobias Messer, Eva Blasco, Martin Wegener, Vincent Hahn, N. Maximilian Bojanowski, Irene Wacker, Rasmus R. Schröder, Ernest Ronald Curticean
Rok vydání: 2021
Předmět:
Zdroj: Nature Photonics. 15:932-938
ISSN: 1749-4893
1749-4885
DOI: 10.1038/s41566-021-00906-8
Popis: 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. As an alternative to high-resolution fabrication by two-photon absorption, researchers demonstrate a two-step absorption process that employs inexpensive light sources.
Databáze: OpenAIRE
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