V. Hahn, T. Messer, N.M. Bojanowski, E.R. Curticean, I. Wacker, R.R. Schröder, E. Blasco, and M. Wegener 

Nat. Photonics 15, 932-938 (2021)

Abstract:

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.

See also:

P.V. Braun and M.L. Brongersma, "Photochemistry democratizes 3D nanoprinting" in Views & News; Nat. Photonics 15, 871-873 (2021)