Ultrasonic wedges for elastic wave bending and splitting without requiringa full band gap

Authors
Torres, M de Espinosa, FRM Aragon, JL
Citation
M. Torres et al., Ultrasonic wedges for elastic wave bending and splitting without requiringa full band gap, PHYS REV L, 86(19), 2001, pp. 4282-4285
Citations number
26
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
86
Issue
19
Year of publication
2001
Pages
4282 - 4285
Database
ISI
SICI code
0031-9007(20010507)86:19<4282:UWFEWB>2.0.ZU;2-6
Abstract
We present a novel twinned-square periodic structure for ultrasonic wave be nding 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 degrees bending of waves and by adequately switching the twinned structure to an u ltrasonic crystal 90 degrees bending is achieved. An extreme refraction law at the grain boundaries is experimentally observed.