Abstract
Applications in micro- and nanotechnologies require millimeter-sized devices that are capable of 3-axis positioning with motion ranges of micrometers and resolutions of nanometers. This paper reports on the design, fabrication and testing of a MEMS-based 3-axis positioning stage. In-plane (comb-drive) and out-of-plane (parallel-plate) electrostatic actuators are employed for driving the stage to move independently along the XYZ directions, by ±12.5 µm in the X and Y directions at an actuation voltage of 30 V and by 3.5 µm in the Z direction at 14.8 V. The structures are designed to achieve highly decoupled motions by effectively suppressing cross-axis motion coupling. The open-loop positioning repeatability is determined to be better than 17.3 nm along all three axes.
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