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APS » Journals » Phys. Rev. Lett. » Volume 86 » Issue 19
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Phys. Rev. Lett. 86, 4282–4285 (2001)

Ultrasonic Wedges for Elastic Wave Bending and Splitting without Requiring a Full Band Gap

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M. Torres1, F. R. Montero de Espinosa2, and J. L. Aragón1,3
1Instituto de Física Aplicada, Consejo Superior de Investigaciones Científicas, Serrano, 144, 28006 Madrid, Spain
2Instituto de Acústica, Consejo Superior de Investigaciones Científicas, Serrano, 144, 28006 Madrid, Spain
3Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 1-1010, Querétaro, 76000, México

Received 16 January 2001; published in the issue dated 7 May 2001

We present a novel twinned-square periodic structure for ultrasonic wave bending and splitting that does not require the existence of a complete band gap and plays the role of an ultrasonic wedge. The device allows 45° bending of waves and by adequately switching the twinned structure to an ultrasonic crystal 90° bending is achieved. An extreme refraction law at the grain boundaries is experimentally observed.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.4282
DOI:
10.1103/PhysRevLett.86.4282
PACS:
43.35.+d
 
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