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Comptes Rendus Physique
Volume 17, n° 5
pages 512-517 (mai 2016)
Doi : 10.1016/j.crhy.2016.02.008
Harvesting vibrations via 3D phononic isolators
Extraction d'énergie vibrationnelle par des isolants phononiques à trois dimensions
 

Ioannis E. Psarobas a, , Vassilios Yannopapas b, Theodore E. Matikas a
a Dept. of Materials Science & Engineering, University of Ioannina, 45110 Ioannina, Greece 
b Dept. of Physics, National Technical University of Athens, 15780 Athens, Greece 

Corresponding author.
Abstract

We report on the existence of unidirectional phononic band gaps that may span over extended regions of the Brillouin zone and can find application in trapping elastic (acoustic) waves in properly designed multilayered 3D structures. Phononic isolators operate as a result of asymmetrical wave transmission through a slab of a crystallographic phononic structure with broken mirror symmetry. Due to the use of lossless materials in the crystal, the absorption rate is dramatically enhanced when the proposed isolator is placed next to a vibrational harvesting cell.

The full text of this article is available in PDF format.
Résumé

Nous rapportons l'existence de bandes interdites phononiques unidirectionnelles qui peuvent se déployer sur des régions étendues de la zone de Brillouin et peuvent être appliquées au piégeage d'ondes (acoustiques) élastiques dans des structures multicouches tridimensionnelles convenablement conçues. Les isolants phononiques opèrent par transmission asymétrique d'ondes à travers une structure phononique cristallographique présentant une symétrie miroir brisée. Du fait de l'utilisation de matériaux sans perte dans le cristal, le taux d'absorption est considérablement accru quand l'isolant proposé est placé près d'une cellule extractrice d'énergie vibratoire.

The full text of this article is available in PDF format.

Keywords : Phononic crystals, Phononic shields, Phononic diode, Trapping vibrations

Mots-clés : Cristaux phononiques, Boucliers phononiques, Diode phononique, Piégeage de vibrations




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