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arXiv · 2401.11942

Single-Photon-Assisted Two-Photon Polymerization

Buse Unlu·Maria Isabel Álvarez-Castaño·Antoine Boniface·Ye Pu·Christophe Moser
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Abstract

Light-based additive manufacturing (AM) has revolutionized the fabrication of complex three-dimensional (3D) objects offering a cost-effective and high-speed alternative to traditional machining. One-photon polymerization is a key process in this advancement, standing out for rapid printing time, albeit with limited resolution. Two-photon polymerization (2PP) empowers AM with unprecedented resolution but is accompanied by a tradeoff of prolonged printing times. We propose combining the single-photon absorption (1PA) and 2PP to benefit from the dual capabilities, allowing for faster printing while maintaining high resolution and improved depth sectioning, respectively. In this study, we employ a blue light source to pre-excite a photocurable resin by 1PA followed by a precisely focused femtosecond (fs) beam to provide the missing energy necessary to reach the polymerization threshold to solidify the resin through two-photon absorption. First, we investigate the impact of pre-sensitization by blue light illumination on 2PP and demonstrate one order of magnitude faster printing time for a voxel size of 150 nm as compared to the same voxel size printed by 2PP only. Then, we build a custom 2PP printer utilizing blue light sensitization in a light-sheet mode and demonstrate successful 3D prints.

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Buse Unlu, Maria Isabel Álvarez-Castaño, Antoine Boniface, Ye Pu, Christophe Moser. 2024-01-22. Single-Photon-Assisted Two-Photon Polymerization. https://doi.org/10.1016/j.addma.2024.104455

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