|Péter Galajda and Pál Ormos
Institute of Biophysics, Biological Research Centre of the Hungarian Academy of Sciences, Temesvári krt. 62., P.O. Box 521, H-6701 Szeged, Hungary
The method is based on the photopolymerisation of light curing resins by focussed laser light. By moving the focus along a predetermined trajectory, objects of arbitrary shape can be built. The force exerted by focussed laser light of the order of 10 mW intensity upon micrometer-size objects has also the right magnitude to move them, i.e. the mechanical systems can be activated by light, too.
We have built complex micromechanical systems by the photopolymerisation method. The technology demonstrator machines have a total size of several microns, they consist of static and moving parts built together as an integrated unit. They are driven by rotors that are rotated by light. With appropriate geometry even the rotation direction of the rotors can be changed: this is an important requirement in practical devices.