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

作者：Morvan B^*; Tinel A; Vasseur J O; Sainidou R; Rembert P; Hladky Hennion A C; Swinteck N; Deymier P A

来源：Journal of Applied Physics, 2014, 116(21): 214901.

DOI：10.1063/1.4903076

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.

• 出版日期2014-12-7