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. 2017 Jul:78:51-56.
doi: 10.1016/j.ultras.2017.03.003. Epub 2017 Mar 6.

Evidence of a broadband gap in a phononic crystal strip

Etienne Coffy  1 , Sébastien Euphrasie  2 , Mahmoud Addouche  2 , Pascal Vairac  2 , Abdelkrim Khelif  2
Affiliations

Evidence of a broadband gap in a phononic crystal strip

Etienne Coffy et al. Ultrasonics. 2017 Jul.

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 450kHz to 1250kHz, which corresponds to a gap-to-midgap ratio of 94%, and the attenuation exceeds 35dB 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.

Keywords: Large band gap; Local resonances; Phononic strip.

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