Journal Article

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

Blasco, Eva, Wacker, Irene, Curticean, Ernest Ronald, Hahn, Vincent, Maximilian, Bojanowski N, Wegener, Martin, Messer, Tobias, Schröder, Rasmus R

2021

Overview

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.

• Publisher: Nature Publishing Group
• Subject: Absorption / Continuous radiation / Excitation / Fabrication / Femtosecond pulsed lasers / Lasers / Light sources / Miniaturization / Nonlinear systems / Nonlinearity / Photoinitiators / Photon absorption / Photons / Photoresists / Semiconductor lasers / Three dimensional printing