Abstract
Polydimethylsiloxane (PDMS) is widely used to build biomedical microdevices because of its excellent properties. Prototyping 2D and 3D PDMS microdevices normally requires a long curing time and must go through multiple steps. In this paper, we propose femtosecond laser stereolithography for the rapid prototyping of PDMS 2D and 3D microstructures. This work presents a new way of rapid curing of PDMS resin on a microsecond timescale using femtosecond laser pulses of megahertz pulse frequency. The proposed technique permits single-step curing and is capable of fabricating 2D and 3D structures in micro-scale. The rapid localized curing can be explained by the volume-constrained quick temperature rise due to the accumulated heating at repetitive irradiation. The rapid cooling following the curing limits the decomposition and, therefore, the PDMS retains its mechanical strength.
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