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Title: Characterization of piezoelectric PZT beam actuators for driving 2D scanning micromirrors
Authors: Koh, K.H.
Kobayashi, T.
Hsiao, F.-L. 
Lee, C. 
Keywords: Micro-electro-mechanical systems (MEMS)
Optical MEMS
Piezoelectric actuator
Issue Date: Aug-2010
Citation: Koh, K.H., Kobayashi, T., Hsiao, F.-L., Lee, C. (2010-08). Characterization of piezoelectric PZT beam actuators for driving 2D scanning micromirrors. Sensors and Actuators, A: Physical 162 (2) : 336-347. ScholarBank@NUS Repository.
Abstract: A silicon micromirror driven by piezoelectric Pb(Zr,Ti)O3 beam actuators has been demonstrated for two-dimensional (2D) scanning mirror applications. Two devices of similar design with different dimensions have been fabricated. The Si mirror is micromachined from the device layer of an SOI wafer, while the piezoelectric beam actuator contains multilayers of Pt/Ti/PZT/Pt/Ti/SiO2/Si which is deposited and released from a SOI wafer. A 1 × 10 PZT arrayed actuator are separately arranged in parallel on a Si beam released from the SOI substrate after the micromachining process. The 10 PZT actuators are electrically connected in series. For the large micromirror device with mirror size of 5 mm × 5 mm, the first resonant frequency for bending mode was measured at 34 Hz, while the second mode, i.e., a twist mode or torsional mode, is measured at a resonant frequency of 198 Hz. For the small micromirror device with mirror size of 3 mm × 3 mm, the bending and torsional modes were observed at 122 Hz and 2.46 kHz respectively. 2D raster scanning patterns were illustrated for both micromirrors. dc superimposed bias effect was also investigated for both mirror sizes. With increased dc bias, larger deflection angles were obtained. © 2010 Elsevier B.V. All rights reserved.
Source Title: Sensors and Actuators, A: Physical
ISSN: 09244247
DOI: 10.1016/j.sna.2010.04.021
Appears in Collections:Staff Publications

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