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Fabrication and Characterization of Micromachined Piezoelectric T-Beam Actuators

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4 Author(s)
Kiron Mateti ; Department of Electrical Engineering, The Pennsylvania State University, University Park, PA, USA ; Zheqian Zhang ; Christopher D. Rahn ; Srinivas Tadigadapa

This paper presents a monolithically fabricated microelectromechanical piezoelectric cantilever beam with a T-shaped cross section capable of in-plane and out-of-plane displacements and sensing. High-aspect-ratio T-beams are achieved by direct micromachining of bulk lead zirconate titanate (PZT-4) via reactive ion etching of 65- μm-deep features. Electrodes deposited on the top and bottom web and flange regions of the T-shaped structure allow in-plane and out-of-plane motion actuation and sensing. The T-beam structures were tested for in-plane and out-of-plane tip displacements, out-of-plane blocking force, and impedance response. These results are explained using analytical models that predict static deflection, blocking force, and resonance frequency. Nine prototype micromachined T-beams are fabricated that achieve up to 129 μm of out-of-plane displacement, 11.6 μm of in-plane displacement, and 700 μN of out-of-plane blocking force.

Published in:

Journal of Microelectromechanical Systems  (Volume:22 ,  Issue: 1 )