Abstract
We report a new, simplified mechanism for performing micro-rotation. A sample chamber filled with aqueous solution and mounted on a piezoelectric transducer (PZT)-driven stage was used to produce flow-induced torque for rotating micro-objects. We demonstrated the scheme by rotating ellipsoidal yeast particles and a two-sphere system with 20 mW of laser power. Clockwise or counterclockwise rotation could be controlled by changing the initial angular position of the object trapped and by reversing the direction of the PZT-driven stage. This mechanism has potential applications in microfabrication, biotechnology and fluidic technology.
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