Abstract
Received 24 February 2009; published 20 October 2009A theoretical and experimental study of the propagation of sound beams in and behind two-dimensionalsonic crystals at frequencies close to the band edges is presented. Beam focusing is predicted and discussed.We evaluate, by analytical numerical methods, the main focusing characteristics, such as the focal distance, thewidth of beam waist, and the beam quality at the waist. The field distribution is shown to depend strongly onthe beam size and frequency. Experiments were performed on narrow sources radiating in ultrasound regime,although the results are extendable to arbitrary frequencies.DOI: 10.1103/PhysRevB.80.134303 PACS number s : 63.20. e, 43.35. d
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