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Updated: Jul 15, 2026
Laser Micromachining for Polymer Surface Topography Design
Published on: September 19, 2025
Effects of optical trapping and liquid surface deformation on the laser microdeposition of a polymer assembly in
Yu Nabetani1, Hiroyuki Yoshikawa, Andrew C Grimsdale
1Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan.
Abstract:
A polymer microassembly is formed by focusing a near-infrared (NIR) laser beam in a thin film of a polymer solution. We have investigated the mechanism of laser microdeposition of a polyfluorene assembly by measuring the surface deformation of the solution film and the morphology of the deposited assembly. It is clearly observed that a rupture is formed at the laser focus in the solution film by using laser interferometric imaging. The time necessary for the rupture formation and the volume of the deposited microassembly are analyzed as a function of laser power. Experimental results suggest that the solution surface deformation induced by local laser heating and optical trapping effects determined the volume of the laser microdeposition. By combining this method with multiple optical trapping, a polymer microassembly with a polygonal morphology is formed on the glass substrate.
