Journal
CRYSTALS
Volume 6, Issue 6, Pages -Publisher
MDPI AG
DOI: 10.3390/cryst6060064
Keywords
phononic crystals; whispering gallery mode; fundamental liquid mode; waveguide; active control
Funding
- Agence Nationale de la Recherche (ANR)
- Delegation Generale de l'Armement (DGA) [443 ANR-11-ASTR-015]
- China Scholarship Council [201406260170]
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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.
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