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 language | English (US) |
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Article number | 214901 |
Journal | Journal of Applied Physics |
Volume | 116 |
Issue number | 21 |
DOIs | |
State | Published - Dec 7 2014 |
ASJC Scopus subject areas
- General Physics and Astronomy