Anisotropic diffraction of bulk acoustic wave beams in lithium niobate

Naumenko, Natalya; Chizhikov, S. I.; Molchanov, V. N.; Yushkov, Konstantin B.

doi:10.1016/j.ultras.2015.06.019

Cited by 9 publications

(4 citation statements)

References 16 publications

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“…The normal vector to the slowness surface is the group velocity S. The second derivatives of the slowness surface characterize its curvature. It has been shown by Khatkevich [65] and by Naumenko et al [66] that far-field spreading of a BAW beam is associated with the slowness surface curvature.…”

Section: Baw Diffraction Tensormentioning

confidence: 99%

“…For calculation of the BAW diffraction tensor the following procedure is used [66,27,29]. The normalized transverse component of the group velocity vector S is defined as…”

Section: Baw Diffraction Tensormentioning

confidence: 99%

“…Moreover, there are autocollimation points, for the slow quasishear mode at the Euler angles θ = 44 • (between axes "B" and "C") and θ = 54 • (between axes "C" and "D"). There are no acoustic axes in this quadrant, and the energy flow angle reaches its maximum of 8.6 • that facilitates design of quasicollinear acousto-optic devices [29].…”

Section: Lithium Niobatementioning

confidence: 99%

“…Nevertheless, studies of the effect of acoustic anisotropy on the parameters of diffracted optical radiation were performed only fragmentarily and for some special cases of acousto-optic interaction geometry in selected crystals. A certain exception are some recent works [28,29,30,31]. In last years, attention has been focused on crystals of lower symmetry systems, namely orthorhombic and monoclinic ones [32,33,34,35,36,37].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Extreme acoustic anisotropy in crystals visualized by diffraction tensor

Науменко¹,

Yushkov²,

Molchanov³

2019

Preprint

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Acoustic wave propagation in single crystals, metamaterials and composite structures is a basic mechanism in acoustic, acousto-electronic and acousto-optic devices. Acoustic anisotropy of crystals provides a variety of device performances and application fields, but its role in pre-estimation of achievable device characteristics and location of crystal orientations with desired properties is often underestimated. A geometrical image of acoustic anisotropy can be an important tool in design of devices based on wave propagation in single crystals or combinations of anisotropic materials. We propose a fast and robust method for survey and visualization of acoustic anisotropy based on calculation of the eigenvalues of bulk acoustic wave (BAW) diffraction tensor (curvature of the slowness surface). The stereographic projection of these eigenvalues clearly reveals singular directions of BAW propagation (acoustic axes) in anisotropic media and areas of fast or slow variation of wave velocities. The method is illustrated by application to three crystals of different symmetry used in different types of acoustic devices: paratellurite, lithium niobate, and potassium gadolinium tungstate. The specific features of acoustic anisotropy are discussed for each crystal in terms of their potential application in devices. In addition, we demonstrate that visualization of acoustic anisotropy of lithium niobate helps to find orientations supporting propagation of high-velocity surface acoustic waves.

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Section: Baw Diffraction Tensormentioning

confidence: 99%

“…For calculation of the BAW diffraction tensor the following procedure is used [66,27,29]. The normalized transverse component of the group velocity vector S is defined as…”

Section: Baw Diffraction Tensormentioning

confidence: 99%

Section: Lithium Niobatementioning

confidence: 99%