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Lehtonen S, Plessky VP, Béreux N, et al. Phases of the SAW reflection and transmission coefficients for short reflectors on 128 degree LiNbO3. IEEE Trans Ultrason Ferroelectr Freq Control. 2004;51(12):1671-82doi: 10.1109/tuffc.2004.1386684.
Lehtonen, S., Plessky, V. P., Béreux, N., & Salomaa, M. M. (2004). Phases of the SAW reflection and transmission coefficients for short reflectors on 128 degree LiNbO3. IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 51(12), 1671-82. https://doi.org/10.1109/tuffc.2004.1386684
Lehtonen, Saku, et al. "Phases of the SAW reflection and transmission coefficients for short reflectors on 128 degree LiNbO3." IEEE transactions on ultrasonics, ferroelectrics, and frequency control vol. 51,12 (2004): 1671-82. doi: https://doi.org/10.1109/tuffc.2004.1386684
Lehtonen S, Plessky VP, Béreux N, Salomaa MM. Phases of the SAW reflection and transmission coefficients for short reflectors on 128 degree LiNbO3. IEEE Trans Ultrason Ferroelectr Freq Control. 2004 Dec;51(12):1671-82. doi: 10.1109/tuffc.2004.1386684. PMID: 15690727.
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IEEE Trans Ultrason Ferroelectr Freq Control. 2004 Dec;51(12):1671-82. doi: 10.1109/tuffc.2004.1386684.

Phases of the SAW reflection and transmission coefficients for short reflectors on 128 degree LiNbO3.

IEEE transactions on ultrasonics, ferroelectrics, and frequency control

Saku Lehtonen, Victor P Plessky, Natacha Béreux, Martti M Salomaa

Affiliations

  1. Materials Physics Laboratory, Helsinki University of Technology, FIN-02015 HUT, Helsinki, Finland. [email protected]

PMID: 15690727 DOI: 10.1109/tuffc.2004.1386684

Abstract

We study numerically the phase of surface acoustic waves reflected by or transmitted through short reflectors comprising only 1-3 aluminium electrodes on 128 degree YX-cut lithium niobate (LiNbO3). The electrodes have a finite thickness, and they are either open-circuited or grounded. The center-to-center distance between adjacent electrodes d corresponds roughly either to half of the characteristic wavelength d proportional to lambda0/2 or to d proportional to lambda0, for the reflectors operating at the fundamental and second harmonic modes, respectively. We use software based on the finite-element and boundary-element methods (FEM/BEM) for numerical experiments with a tailored test structure having 3 interdigital transducers (IDTs), simulating experimental conditions with an incident wave and reflected and transmitted surface acoustic wave (SAW). Using artificial enhancement of time resolution in conjunction with the fast Fourier transform (FFT) and time-gating, calculation of the Y-parameters in a relatively wide frequency range allows us to determine the phase of the reflection and transmission coefficients.

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