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Updated: Feb 15, 2026

Laser Micromachining for Polymer Surface Topography Design
Published on: September 19, 2025
Paper-like Surface Microstructure Fabricated on a Polymer Surface by Femtosecond Laser Machining
Kenji Goya1, Yusuke Fuchiwaki1
1Health Research Institute, National Institute of Advanced Industrial Science and Technology.
Abstract:
In this study, we demonstrate the precise control of fluid flow using femtosecond (FS) laser-induced microstructures. A microgroove structure inscribed on a poly(methyl methacrylate) (PMMA) substrate functions as a superhydrophilic membrane similar to paper. We first estimated the flow rate for pure water on microgrooves fabricated at various laser fluences in the range from 9.2 to 100.8 J/cm2. The results showed that the flow rate could be tuned in the range from 0.30 to 12.07 μL/s by varying the laser irradiation parameters. The fluid flow was reproducible, with a calculated relative standard deviation (RSD%) of less than 8% in the flow rate. We then fabricated a microfilter for blood separation and estimated its filtration ability using artificial blood containing resin microparticles. This method would be useful in a technology related to a paper-based diagnostic device for precise reagent manipulation.
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