We introduce a system of light driven microscopic autonomous moving particles
that move on a flat surface. The design is simple, yet effective: Micrometer
sized objects with wedge shape are produced by photopolymerization, they are
covered with a reflective surface. When the area of motion is illuminated
perpendicularly from above, the light is deflected to the side by the wedge
shaped objects, in the direction determined by the position and orientation of
the particles. The momentum change during reflection provides the driving force
for an effectively autonomous motion. The system is an efficient tool to study
self propelled microscopic robots
