Analysis of interaction between two SAW modes in Pt grating on langasite cut (0°, 138.5°, 26.6°)

The numerical technique based on a previously developed rational approximation of harmonic admittance of a periodic grating was applied to analysis of SAW behavior in platinum grating on langasite cut with Euler angles (0°, 138.5°, 26.6°). The approximation is able to take into account interaction b...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2011-11, Vol.58 (11), p.2370-2377
Main Author: Naumenko, N. F.
Format: Article
Language:English
Subjects:
Admittance
Approximation methods
Dispersion
Electrodes
Gratings
Materials Testing
Mathematical model
Platinum - chemistry
Reflection
Scattering, Radiation
Silicates - chemistry
Sound
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Summary:The numerical technique based on a previously developed rational approximation of harmonic admittance of a periodic grating was applied to analysis of SAW behavior in platinum grating on langasite cut with Euler angles (0°, 138.5°, 26.6°). The approximation is able to take into account interaction between surface and bulk waves or between two SAW modes. SAW dispersion was calculated at different values of electrode thickness varying between 1% and 4% of wavelength. It was found that with increasing Pt thickness, SAW behavior in the grating is strongly affected by interaction between two SAW modes propagating in the same orientation. An additional stopband, which results from this interaction, occurs at certain detuning from synchronous reflection condition and can cause spurious resonances of the admittance function. Interaction between two SAW modes is also responsible for anomalously slow growth of reflectivity with increasing platinum thickness.
ISSN:0885-3010
1525-8955
DOI:10.1109/TUFFC.2011.2094