Abstract：
:The propagation of thickness shear waves in a periodically corrugated quartz crystal plate is investigated in the present paper using a power series expansion technique. In the proposed simulation model, an equivalent continuity of shear stress moment is introduced as an approximation to handle sectional interfaces with abrupt thickness changes. The Bloch theory is applied to simulate the band structures for three different thickness variation patterns. It is shown that the power series expansion method exhibits good convergence and accuracy, in agreement with results by finite element method (FEM). A broad stop band can be obtained in the power transmission spectra owing to the trapped thickness shear modes excited by the thickness variation, whose physical mechanism is totally different from the well-known Bragg scattering effect and is insensitive to the structural periodicity. Based on the observed energy trapping phenomenon, an acoustic wave filter is proposed in a quartz plate with sectional decreasing thickness, which inhibits wave propagation in different regions.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Li P,Cheng Ldoi
10.1016/j.ultras.2017.02.004subject
Has Abstractpub_date
2017-05-01 00:00:00pages
100-109eissn
0041-624Xissn
1874-9968pii
S0041-624X(17)30106-3journal_volume
77pub_type
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