Acoustic beam splitting in a sonic crystal around a directional band gap

doi:10.1088/1674-1056/22/11/114301

Abstract Beam splitting upon refraction in a triangular sonic crystal composed of aluminum cylinders in air is experimentally and numerically demonstrated to occur due to finite source size, which facilitates circumvention of a directional band gap. Experiments reveal that two distinct beams emerge at crystal output, in agreement with the numerical results obtained through the finite-element method. Beam splitting occurs at sufficiently-small source sizes comparable to lattice periodicity determined by the spatial gap width in reciprocal space. Split beams propagate in equal amplitude, whereas beam splitting is destructed for oblique incidence above a critical incidence angle.

Keywords: sonic crystal directional band gap source size beam splitting

Received: 12 March 2013
Revised: 01 April 2013
Accepted manuscript online:

PACS:	43.20.El	(Reflection, refraction, diffraction of acoustic waves)
	43.40.Fz	(Acoustic scattering by elastic structures)
	43.58.Fm	(Sound level meters, level recorders, sound pressure, particle velocity, And sound intensity measurements, meters, and controllers)

Fund: Project supported by Akdeniz University Scientific Research Projects Coordination Unit.

Corresponding Authors: Ahmet Cicek
E-mail: ahmetcicek@mehmetakif.edu.tr

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Ahmet Cicek, Olgun Adem Kaya, Bulent Ulug Acoustic beam splitting in a sonic crystal around a directional band gap 2013 Chin. Phys. B 22 114301

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