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Crystals 2017, 7(12), 372; doi:10.3390/cryst7120372

Phononic Crystal Made of Multilayered Ridges on a Substrate for Rayleigh Waves Manipulation

1
CNRS, Institut Jean Lamour, UMR 7198, F-54506 Vandœuvre-lès-Nancy, France
2
Institut Jean Lamour, Université de Lorraine, UMR 7198, 54506 Vandœuvre-lès-Nancy, France
3
Institut d’Electronique, de Micro-électronique et de Nanotechnologie (IEMN–UMR CNRS 8520), Université de Lille, Sciences et Technologies, Cité Scientifique, 59652 Villeneuve d’Ascq, France
4
Sorbonne Universités, UPMC Université Paris 06, INSP UMR CNRS 7588, 4 Place Jussieu, 75005 Paris, France
*
Author to whom correspondence should be addressed.
Academic Editors: Abdelkrim Khelif and Sarah Benchabane
Received: 6 November 2017 / Revised: 3 December 2017 / Accepted: 6 December 2017 / Published: 12 December 2017
(This article belongs to the Special Issue Phononics)
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Abstract

We present a phononic crystal to achieve efficient manipulation of surface acoustic waves (SAW). The structure is made of finite phononic micro-ridges arranged periodically in a substrate surface. Each ridge is constructed by staking silicon and tungsten layers so that it behaves as one-dimensional phononic crystal which exhibits band gaps for elastic waves. The band gap allows the existence of resonance modes where the elastic energy is either confined within units in the free end of the ridge or the ones in contact with the substrate. We show that SAW interaction with localized modes in the free surface of the ridge gives rise to sharp attenuation in the SAW transmission, while the modes confined within the ridge/substrate interface cause broad band attenuations of SAW. Furthermore, we demonstrate that the coupling between the two kinds of modes within the band gap gives high SAW transmission amplitude in the form of Fano-like peaks with high quality factor. The structure could provide an interesting solution for accurate SAW control for sensing applications, for instance. View Full-Text
Keywords: phononic crystal; surface acoustic wave; Fano resonance phononic crystal; surface acoustic wave; Fano resonance
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Oudich, M.; Djafari-Rouhani, B.; Bonello, B.; Pennec, Y.; Sarry, F. Phononic Crystal Made of Multilayered Ridges on a Substrate for Rayleigh Waves Manipulation. Crystals 2017, 7, 372.

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