Evidence of a large elastic band gap in a one-dimensional phononic crystal

Abstract : The aim of this work is to study the mechanisms of enlargement of band gaps in phononic strips and to present the characterization of such a structure. Indeed, to our knowledge, the gap-to-midgap ratio of the PC strips used for applications in literature does not exceed 45%. Yet, large band gaps generally imply better performances for phononic devices and a stronger robustness to fabrication tolerances. Using three different structures based on tungsten pillars fixed on a tailored silicon strip, we show that large band gaps can be obtained by coupling Bragg scattering and local resonances. Optical measurements made on a structure of few millimeters show good agreement with numerical calculations. The three periods phononic strip exhibits a main band gap with a gap-to-midgap ratio close to 100% and a maximum attenuation of −40 dB.
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https://hal.archives-ouvertes.fr/hal-02355296
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Submitted on : Friday, November 8, 2019 - 11:03:05 AM
Last modification on : Saturday, November 9, 2019 - 1:44:06 AM

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  • HAL Id : hal-02355296, version 1

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Etienne Coffy, Sébastien Euphrasie, Pascal Vairac, Abdelkrim Khelif. Evidence of a large elastic band gap in a one-dimensional phononic crystal. International Ultrasonics Symposium, Sep 2016, Tours, France. ⟨hal-02355296⟩

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