Abstract
Acoustic waves in a phononic crystal (PnC) showed properties of band gaps and anisotropic propagation and promised many applications. By arranging the filling fraction of PnCs gradually in space, a gradient-index (GRIN) PnC was proposed to bend the wave propagation. GRIN PnCs were reported and applied as an acoustic lens to focus acoustic waves. Theoretically, this kind of lens has a hyperbolic secant refractive index profile along the transverse direction. In this paper, a two-dimensional GRIN PnC for surface acoustic wave (SAW) was studied. The anisotropy of SAW in PnCs was analyzed and trajectories of a SAW beam were estimated. A 16-layers GRIN tungsten/silicon PnC lens was designed. FEM simulation showed that a 150-MHz SAW beam was focused in the GRIN PnC. The GRIN PnC could be applied as a beam aperture modifier or a beamwidth compressor.
| Original language | English |
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| Title of host publication | 2016 IEEE International Ultrasonics Symposium, IUS 2016 |
| Publisher | IEEE Computer Society |
| ISBN (Electronic) | 9781467398978 |
| DOIs | |
| State | Published - 01 11 2016 |
| Event | 2016 IEEE International Ultrasonics Symposium, IUS 2016 - Tours, France Duration: 18 09 2016 → 21 09 2016 |
Publication series
| Name | IEEE International Ultrasonics Symposium, IUS |
|---|---|
| Volume | 2016-November |
| ISSN (Print) | 1948-5719 |
| ISSN (Electronic) | 1948-5727 |
Conference
| Conference | 2016 IEEE International Ultrasonics Symposium, IUS 2016 |
|---|---|
| Country/Territory | France |
| City | Tours |
| Period | 18/09/16 → 21/09/16 |
Bibliographical note
Publisher Copyright:© 2016 IEEE.
Keywords
- beam focusing
- gradient-index phononic crystal
- surface acoustic wave