Acoustic properties of piezoactive heterostructures made of thin lithium niobate plates

Author details
  • Federal Research Centre the Southern Scientific Centre of the Russian Academy of Sciences, Rostov-on-Don, Russian Federation
  • Federal Research Centre the Southern Scientific Centre of the Russian Academy of Sciences, Rostov-on-Don, Russian Federation
  • Federal Research Centre the Southern Scientific Centre of the Russian Academy of Sciences, Rostov-on-Don, Russian Federation
  • Federal Research Centre the Southern Scientific Centre of the Russian Academy of Sciences, Rostov-on-Don, Russian Federation

Abstract

A mathematical model of excitation of surface acoustic waves (SAW) on the surface of a piezoelectric heterostructure "lithium niobate W-cut plate – silicon substrate" has been developed and investigated, where W is a cut, the normal to the surface of which has the directions of the most common industrial cuts Z, X, Y, 41Y, 64Y, 128Y. Along with the cut orientation, the model takes into account the direction of wave propagation and the plate thickness in relation to the wavelength, which allows choosing crystallographic and geometric parameters for efficient excitation of SAWs. A study of the phase velocity of Rayleigh and Love waves on the heterostructure surface was carried out for two cases: when its surface is free and when it is metallized and grounded. This made it possible to calculate the electromechanical coupling coefficient (EMCC), which characterizes the excitation efficiency of both Rayleigh and horizontally polarized shear SAWs in the heterostructure. The study showed that on lithium niobate plates of all types of cuts, the Love waves EMCC reaches higher values compared to the Rayleigh waves KEMS. Of all the industrial types of lithium niobate plate cuts on this heterostructure, the most effective for exciting Love waves are the X-, Y- and 128Y-cuts, on which the EMCC reaches values of 0.4, 0.38 and 0.39, respectively. An additional study revealed the 160Y cut, on which the EMCC reaches an absolute maximum. The obtained results provide an opportunity to significantly simplify the process of designing SAW devices and devices by selecting the optimal geometric parameters of the heterostructure with a lithium niobate plate of a given cut.

Keywords

heterostructurelithium niobatethin plates(XYZβY)-cutsurface acoustic wave (SAW)electromechanical coupling coefficient (EMCC)

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Article information

Published
8 December 2025
Issue date
8 December 2025
Issue
No. 4 (2025)
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