| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5485445 | Ultrasonics | 2017 | 14 Pages |
Abstract
We experimentally demonstrate a very large ultrasonic band gap in a one-dimensional phononic crystal. The structure consists of periodic tungsten pillars fixed to a tailored silicon strip with a layer of epoxy. Combining local resonances and Bragg scattering, the gap ranges from 450Â kHz to 1250Â kHz, which corresponds to a gap-to-midgap ratio of 94%, and the attenuation exceeds 35Â dB with only three periods. Numerical calculations with the Finite Element Method are performed to support the analysis and provide a better understanding of the behavior of the structure. In particular, the role of the thin layer of epoxy is studied and is shown to have a strong influence on the dispersion. This phononic structure with a very large band gap can be considered as a new tool to design acoustic devices with high performances.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Acoustics and Ultrasonics
Authors
Etienne Coffy, Sébastien Euphrasie, Mahmoud Addouche, Pascal Vairac, Abdelkrim Khelif,