ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The change in phase velocity produced by a bias electric field on Lamb acoustic waves propagating along yz- and zy-LiNbO3 plates is analyzed here. This effect is interpreted theoretically in terms of the modifications produced by the bias field on the second-order material constants, under the approximation of small-amplitude acoustic waves superposed on a bias. According to this theory, these modifications are linked to the components of the bias field through combinations of second- and third-order material constants. Measurements performed on several Lamb modes lead to the determination of the effective second-order material constants in the presence of a bias field. The results obtained allow the evaluation of the electroelastic effect for acoustic propagation along any direction in the yz plane of the crystal, provided that the bias electric field lies in the same plane. In addition, these results give useful information on the nonlinear properties of the medium.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.341913
