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

Bruno Morvan | Zendy; Alain Tinel | Zendy; J. O. Vasseur | Zendy; R. Sainidou | Zendy; Pascal Rembert | Zendy; Anne-Christine Hladky | Zendy; N. Swinteck | Zendy; Pierre A. Deymier | Zendy

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

Author(s) -

Bruno Morvan,

Alain Tinel,

J. O. Vasseur,

R. Sainidou,

Pascal Rembert,

Anne-Christine Hladky,

N. Swinteck,

Pierre A. Deymier

Publication year - 2014

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.4903076

Subject(s) - collimated light , acoustic wave , optics , materials science , acoustic metamaterials , dispersion (optics) , crystal (programming language) , acoustic dispersion , monochromatic color , longitudinal wave , beam (structure) , acoustics , wave propagation , physics , laser , computer science , programming language

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.

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