Refractive and focusing behaviours of tunable sonic crystals with dielectric elastomer cylindrical actuators

Wen Pei Yang, Liang Yu Wu, Lien Wen Chen

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

The refractive and focusing behaviours of a tunable sonic crystal (SC) consisting of air and dielectric elastomer (DE) cylindrical actuators are investigated. The refractive direction of the acoustic wave in SCs is predicted from the equivalent frequency surface obtained by the plane-wave expansion method. The inner and outer radii of the cylindrical actuators are increased with the electric field which is applied between the electrodes on the internal and external lateral surfaces. Therefore, the dispersion relation is varied with the geometric adjustment of the DE tubes and the refractions of acoustic wave in SCs are changed from positive to negative with the increase in the applied electric field. Based on the geometry adjustment of the cylindrical actuator, a tunable acoustic superlens could be proposed by a SC slab with DE tubes. The distance from the surface of the slab to the centre of the image spot can be changed with different electric fields. Thus, extensive applications of such a phenomenon to acoustic devices are anticipated.

Original languageEnglish
Article number135408
JournalJournal of Physics D: Applied Physics
Volume41
Issue number13
DOIs
Publication statusPublished - 2008 Jul 7

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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