Article,

High resolution femtosecond direct laser writing with wrapped lens

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Opt. Mater. Express, 12 (9): 3801--3809 (September 2022)
DOI: 10.1364/OME.468534

Abstract

Wrapped writing mode is a simple, inexpensive approach to multiphoton stereolithography. Standard &\#x223C;10 &\#x00B5;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.

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