Medical applications of piezoelectric microelectromechanical systems

F. Griggio, H. Kim, S. O. Ural, T. N. Jackson, K. Choi, R. L. Tutwiler, S. Trolier-Mckinstry

Research output: Contribution to journalConference article

2 Scopus citations

Abstract

Bulk piezoelectric ceramics and single crystals are widely used in medical applications, including medical ultrasonic imaging, therapeutic ultrasound, and drug delivery. This paper reviews possibilities for thin film micromachined components as alternatives to the bulk devices. Particular emphasis is placed on the development of a CMOS-compatible ultrasound system. For this purpose, a piezoelectric ultrasound system on a Si substrate was fabricated using a diaphragm geometry transducer with PZT films. A 1-D array of 8 elements was designed and fabricated using 4 photolithography steps. Cavities under the resonating elements were obtained by XeF2 etching from the top-side of the wafer. Capacitance and admittance spectra showed a resonance at ∼ 42 MHz for the fabricated structures with a quality factor of 2.1, this resonance was higher than the one predicted by the natural frequency equation for circular plate. Catch- and pitch-mode tests were performed in water. Sensing and actuating functionalities were demonstrated for the fabricated devices, with collected signals of 40 mV peak-to-peak at a distance of 7.2 mm during the catch-mode test and amplitudes as high as 15 mV peak-to-peak at a distance of 7.4 mm during the pitch-mode test. A bandwidth of 83% was calculated during pitch-mode test.

Original languageEnglish (US)
Pages (from-to)169-186
Number of pages18
JournalIntegrated Ferroelectrics
Volume141
Issue number1
DOIs
StatePublished - Jun 12 2013
EventInternational Symposium on Integrated Functionalities, ISIF 2012 - Hong Kong, Hong Kong
Duration: Jun 18 2012Jun 21 2012

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Control and Systems Engineering
  • Ceramics and Composites
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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