Evidence of a broadband gap in a phononic crystal strip
Affiliation auteurs | !!!! Error affiliation !!!! |
Titre | Evidence of a broadband gap in a phononic crystal strip |
Type de publication | Journal Article |
Year of Publication | 2017 |
Auteurs | Coffy E, Euphrasie S, Addouche M, Vairac P, Khelif A |
Journal | ULTRASONICS |
Volume | 78 |
Pagination | 51-56 |
Date Published | JUL |
Type of Article | Article |
ISSN | 0041-624X |
Mots-clés | Large band gap, Local resonances, Phononic strip |
Résumé | 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 450 kHz to 1250 kHz, which corresponds to a gap-to-midgap ratio of 94%, and the attenuation exceeds 35 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. (C) 2017 Elsevier B.V. All rights reserved. |
DOI | 10.1016/j.ultras.2017.03.003 |