Ultra-directional source of longitudinal acoustic waves based on a two-dimensional solid/solid phononic crystal

B. Morvan, A. Tinel, J. O. Vasseur, R. Sainidou, P. Rembert, A. C. Hladky-Hennion, N. Swinteck, P. A. Deymier

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Phononic crystals (PC) can be used to control the dispersion properties of acoustic waves, which are essential to direct their propagation. We use a PC-based two-dimensional solid/solid composite to demonstrate experimentally and theoretically the spatial filtering of a monochromatic non-directional wave source and its emission in a surrounding water medium as an ultra-directional beam with narrow angular distribution. The phenomenon relies on square-shaped equifrequency contours (EFC) enabling self-collimation of acoustic waves within the phononic crystal. Additionally, the angular width of collimated beams is controlled via the EFC size-shrinking when increasing frequency.

Original languageEnglish (US)
Article number214901
JournalJournal of Applied Physics
Volume116
Issue number21
DOIs
StatePublished - Dec 7 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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