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Crystals 2016, 6(6), 64; doi:10.3390/cryst6060064

Phononic Crystal Plate with Hollow Pillars Actively Controlled by Fluid Filling

1
Institut d’Electronique, de Microélectronique et de Nanotechnologie, UMR CNRS 8520, Université de Lille 1, Villeneuve d’Ascq 59650, France
2
School of Aerospace Engineering and Applied Mechanics, Tongji University, 100 Zhangwu Road, Shanghai 200092, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Victor J. Sanchez-Morcillo, Vicent Romero-Garcia and Luis M. Garcia-Raffi
Received: 6 April 2016 / Revised: 14 May 2016 / Accepted: 19 May 2016 / Published: 24 May 2016
(This article belongs to the Special Issue Phononic Crystals)
View Full-Text   |   Download PDF [4944 KB, uploaded 24 May 2016]   |  

Abstract

We investigate theoretically the properties of phononic crystal plates with hollow pillars. Such crystals can exhibit confined whispering gallery modes around the hollow parts of the pillars whose localization can be increased by separating the pillar from the plate by a full cylinder. We discuss the behaviors of these modes and their potential applications in guiding and filtering. Filling the hollow parts with a fluid gives rise to new localized modes, which depend on the physical properties and height of the fluid. Thus, these modes can be actively controlled for the purpose of multichannel multiplexing. In particular, one can obtain localized modes associated with the compressional vibrations of the fluid along its height. They can be used for the purpose of sensing the acoustic properties of the fluid or their variations with temperature. View Full-Text
Keywords: phononic crystals; whispering gallery mode; fundamental liquid mode; waveguide; active control phononic crystals; whispering gallery mode; fundamental liquid mode; waveguide; active control
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Jin, Y.; Pennec, Y.; Pan, Y.; Djafari-Rouhani, B. Phononic Crystal Plate with Hollow Pillars Actively Controlled by Fluid Filling. Crystals 2016, 6, 64.

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