Single-exposure fabrication of functional microstructures via two-photon photopolymerization

Abstract

Microstructures are fabricated by exposing a photopolymer to doughnut beams of different topological charge. The doughnut beams are created by imparting a helical pitch onto the incident light via a phaseonly spatial light modulator. The light reaching the resin is the Fourier transform of the phase hologram corresponding to Laguerre-Gaussian modes. The resulting microstructures in the resin however do not form simple rings but instead resemble cogwheels, which can be used as component for micro-integrated systems. Rather than using scanning approach, our technique allows for single-exposure microfabrication of functional microdevices.