Phys.org October 7, 2023 Femtosecond laser–based technique called two-photon polymerization (TPP) has emerged as a powerful tool for nanofabrication and integrating nanomaterials. However, challenges persist in existing 3D nanoprinting methods, such as slow layer-by-layer printing and limited material options due to laser-matter interactions. An international team of researchers (USA – Purdue University, Germany, UK) has developed free-space nanopainting using an optical force brush (OFB) which enabled precise spatial writing paths, instantaneous adjustment of linewidths and concentrations, and unrestricted resolution beyond optical limits. OFB allowed rapid aggregation and solidification of radicals, resulting in narrower lines at lower polymerization thresholds and enhanced […]