Volume 55, Number 6, September II 2001
|Page(s)||841 - 846|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||01 December 2003|
Absolute acoustic band gap in coupled multilayer structures
Laboratoire de Dynamique et d'Optique des Matériaux,
Département de Physique Faculté des Sciences,
Université Mohamed I - B.P. 524, 60000 Oujda, Morocco
2 Laboratoire de Dynamique et Structure des Matériaux Moléculaires, UPRESA, CNRS 8024, UFR de Physique, Université de Lille 1 - 59655 Villeneuve d'Ascq, France
Accepted: 29 June 2001
We show theoretically that by combining two or more finite superlattices, it is possible to realize an omnidirectional acoustic mirror that prevents propagation of acoustic waves over a wide range of frequencies. An appropriate choice of the elastic parameters in the superlattices enables us to propose a structure in which any incident wave launched from any type of substrate (or vacuum) falls inside a minigap of the coupled SLs and therefore undergoes a total reflection.
PACS: 68.35.Gy – Mechanical properties; surface strains / 68.35.Ja – Surface and interface dynamics and vibrations / 68.65.-k – Low-dimensional, mesoscopic, and nanoscale systems: structure and nonelectronic properties
© EDP Sciences, 2001
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