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- Title
Anisotropic surface acoustic waves in tungsten/lithium niobate phononic crystals.
- Authors
Sun, Jia-Hong; Yu, Yuan-Hai
- Abstract
Phononic crystals (PnC) were known for acoustic band gaps for different acoustic waves. PnCs were already applied in surface acoustic wave (SAW) devices as reflective gratings based on the band gaps. In this paper, another important property of PnCs, the anisotropic propagation, was studied. PnCs made of circular tungsten films on a lithium niobate substrate were analyzed by finite element method. Dispersion curves and equal frequency contours of surface acoustic waves in PnCs of various dimensions were calculated to study the anisotropy. The non-circular equal frequency contours and negative refraction of group velocity were observed. Then PnC was applied as an acoustic lens based on the anisotropic propagation. Trajectory of SAW passing PnC lens was calculated and transmission of SAW was optimized by selecting proper layers of lens and applying tapered PnC. The result showed that PnC lens can suppress diffraction of surface waves effectively and improve the performance of SAW devices.
- Subjects
ACOUSTIC surface waves; LITHIUM niobate; PHONONIC crystals; PHOTONIC band gap structures; ANISOTROPY; TUNGSTEN films
- Publication
Applied Physics A: Materials Science & Processing, 2018, Vol 124, Issue 2, p0
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-018-1605-6