For 20 years, nanoscale 3D printing has been based on two-photon absorption, requiring expensive pulsed lasers. Now, via a two-step absorption process, such printing has been demonstrated using a low-cost, low-power continuous-wave laser diode, showing the potential for dramatic cost reductions in 3D nanoprinting.
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Braun, P.V., Brongersma, M.L. Photochemistry democratizes 3D nanoprinting. Nat. Photon. 15, 871–873 (2021). https://doi.org/10.1038/s41566-021-00911-x
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DOI: https://doi.org/10.1038/s41566-021-00911-x
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