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Surface Acoustic Waves in Piezoelectric Half Space With Periodic Surface Electrodes

[+] Author Affiliations
Chien-Hsun Lai

Ability Opto-Electronics Technology, Taichung, Taiwan, R.O.C.

Yuan-Fang Chou

National Taiwan University, Taipei, Taiwan, R.O.C.

Paper No. IMECE2009-12127, pp. 129-136; 8 pages
doi:10.1115/IMECE2009-12127
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 15: Sound, Vibration and Design
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4388-8 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

Surface acoustic waves of piezoelectric half space with periodic surface electrodes are investigated. Since the boundary has periodic character, Bloch’s theorem and plane wave expansion method are employed in the analysis. Modeling the periodic electrode’s mechanical effects and electric boundary conditions of short grating and open grating are major tasks. Verification is performed on a 128°YX-LiNbO3 substrate covered by aluminum electrodes. Cases of different electrode aspect ratios are also investigated. Comparisons of dispersion curves corresponding to different boundary conditions are given. The effect of electrode aspect ratio on band gap width is obvious. The developed solution scheme finds the dispersion relations and propagation modes very efficiently and accurately.

Copyright © 2009 by ASME

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