Effects of wave propagation anisotropy on the wave focusing by negative refractive sonic crystal flat lenses

doi:10.1088/1674-1056/21/12/126202

Abstract In this study, wave propagation anisotropy in a triangular lattice crystal structure and its associated waveform shaping in a crystal structure are investigated theoretically. A directional variation in wave velocity inside a crystal structure is shown to cause bending wave envelopes. The authors report that a triangular lattice sonic crystal possesses six numbers of a high symmetry direction, which leads to a wave convergence caused by wave velocity anisotropy inside the crystal. However, two of them are utilized mostly in wave focusing by an acoustic flat lens. Based on wave velocity anisotropy, the pseudo ideal imagining effect obtained in the second band of the flat lens is discussed.

Keywords: sonic crystal wave focusing flat lens ideal imaging

Received: 19 April 2012
Revised: 15 May 2012
Accepted manuscript online:

PACS:	62.65.+k	(Acoustical properties of solids)
	43.20.El	(Reflection, refraction, diffraction of acoustic waves)
	43.35.Cg	(Ultrasonic velocity, dispersion, scattering, diffraction, and Attenuation in solids; elastic constants)

Corresponding Authors: S. Alagoz
E-mail: serkan.alagoz@inonu.edu.tr

Cite this article:

S. Alagoz Effects of wave propagation anisotropy on the wave focusing by negative refractive sonic crystal flat lenses 2012 Chin. Phys. B 21 126202

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Effects of wave propagation anisotropy on the wave focusing by negative refractive sonic crystal flat lenses

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