Analysis of Longitudinal Leaky SAW on LiNbO3 Thin Plate/Amorphous Layer/Quartz Structure

Shiori Asakawa, Jun Mizuno, Junki Hayashi, Masashi Suzuki, Shoji Kakio, Ami Tezuka, Hiroyuki Kuwae, Hiroaki Yokota, Toshifumi Yonai, Kazuhito Kishida

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)


To obtain bonded structure with a low residual stress and a low attenuation for longitudinal leaky surface acoustic waves (LLSAWs), the propagation and resonance properties of an LLSAW on an amorphous layer inserted between LiNbO3 (LN) thin plate and an X-cut quartz substrate were theoretically analyzed. The attenuation of LLSAW on the metallized surface of an X-cut 36°Y-propagating LN (X36°Y-LN)/Al2O3/X35°Y-quartz structure was calculated to be 0.0001 dB/λ at the normalized LN thin-plate thickness h/λ=0.072 (λ: wavelength) and was lower than that on an X36°Y-LN/X35°Y-quartz structure. Using a finite element method (FEM) system for analysis, for the X36°Y-LN/Al2O3/X35°Y-quartz model, we found that the Q factor was improved to 82,000 from 15,000 for the X36°Y-LN/X35°Y-Q model. It is considered that the attenuation was reduced by the suppression of the leakage of the shear vertical component when the Al2O3 layer was inserted. For the same structure, but in which the mechanical loss Qm of 1,000 for LN was assumed, the Q factor was determined to be 2,500 and 1,900 with and without an inserted amorphous Al2O3 layer, respectively.

Original languageEnglish
Title of host publication2019 IEEE International Ultrasonics Symposium, IUS 2019
PublisherIEEE Computer Society
Number of pages4
ISBN (Electronic)9781728145969
Publication statusPublished - 2019 Oct
Event2019 IEEE International Ultrasonics Symposium, IUS 2019 - Glasgow, United Kingdom
Duration: 2019 Oct 62019 Oct 9

Publication series

NameIEEE International Ultrasonics Symposium, IUS
ISSN (Print)1948-5719
ISSN (Electronic)1948-5727


Conference2019 IEEE International Ultrasonics Symposium, IUS 2019
Country/TerritoryUnited Kingdom


  • bonded structure
  • longitudinal leaky SAW
  • quartz

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


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