High resolution femtosecond direct laser writing with wrapped lens

Wrapped writing mode is a simple, inexpensive approach to multiphoton stere-olithography. Standard similar to 10 mu m thin cling foil shields the objective from direct contact with the photoresist, without compromising writing resolution. A diffraction limited lateral voxel width below 150 nm was demonstrated through ray tracing simulations and electron microscopy using standard polymer photoresist. Wrapped mode, like dip-in printing, is not limited by the objective working distance height. Its utility to prototype new print resists was validated through custom aqueous protein, silver nitrate, and black epoxy based formulations. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Automated summary

Wrapped writing mode is a simple and cost-effective approach to multiphoton stereolithography, offering wide application prospects. By using a thin cling foil to shield the objective, it ensures writing resolution without direct contact. Moreover, this method is not limited by the working distance height of the objective and can be used for prototyping various formulations.