Anisotropic surface acoustic waves in tungsten/lithium niobate phononic crystals

Sun, Jia-Hong; Yu, Yuan-Hai

doi:10.1007/s00339-018-1605-6

Cited by 1 publication

(1 citation statement)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A special class of acoustic media with engineered anisotropy are 3D metamaterials [5,6,7,8,9]. Acoustic metamaterials and multilayer composite structures designed of anisotropic crystals demonstrate the second level of complexity [10,11,12,13,14,15,16,17,18,19,20]. Deep understanding of BAW anisotropy features of crystalline components is crucial in design of such structures.…”

Section: Introductionmentioning

confidence: 99%

Extreme acoustic anisotropy in crystals visualized by diffraction tensor

Науменко¹,

Yushkov²,

Molchanov³

2019

Preprint

View full text Add to dashboard Cite

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.

show abstract