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New acoustic plate modes with Quasi-Linear polarizations

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1 Author(s)
Vladimir I. Anisimkin ; Kotel¿nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow, Russia

New acoustic plate modes (APMs) with quasi-shear-vertical (QSV) and quasi-shear-horizontal (QSH) polarizations are found numerically in piezoelectric, nonpiezoelectric, and isotropic plates with free faces. Experimental verification of the modes is accomplished for ST,X-quartz plate, as an example. Similar to the modes with quasi-longitudinal displacement reported recently, the new counterparts exist when their velocities vAPM are close to the velocities vBAW of the relevant bulk waves, the value of the dispersion slope dvAPM/d(h/λ) is low enough (dvAPM/d(h/λ) ~100 m/s, where h is thickness and λ is wavelength), and allowable plate thickness h/λ form a regular succession. All modes with quasi-linear polarization originate from generalized Lamb modes transformed at the aforementioned conditions.

Published in:

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control  (Volume:59 ,  Issue: 10 )