Phys. Rev. Lett. 80, 5325 - 5328 (1998)Sound Attenuation by a Two-Dimensional Array of Rigid Cylinders
J. V. Sánchez-Pérez1, D. Caballero2, R. Mártinez-Sala1, C. Rubio1, J. Sánchez-Dehesa2 *, F. Meseguer1,3 †, J. Llinares1, and F. Gálvez1
In this Letter we present an experimental analysis of the acoustic transmission of a two-dimensional periodic array of rigid cylinders in air with two different geometrical configurations: square and triangular. In both configurations, and above a certain filling fraction, we observe an overlap, in the range of the audible frequencies, between the attenuation peaks measured along the two high-symmetry directions of the Brillouin zone. This effect is considered as the fingerprint of the existence of a full acoustic gap. Nevertheless, the comparison with our calculation of band structures shows that the triangular lattice has band states in that frequency range. We call them deaf bands. This contradictory result is explained by looking at the symmetry of the deaf bands; they cannot be excited by experiments of sound transmission. ©1998 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevLett.80.5325
* Authors to whom correspondence should be addressed.Electronic addresses: jsdehesa@uamca3.fmc.uam.es,fmese@fis.upv.es
See AlsoFocus Story: Phys. Rev. Focus 1, story 20 [ Abstract | Previous article | Next article | Issue 24 ] |
A new free weekly publication from APS 
Read the latest from Physics:
Viewpoint: Can superconducting rings provide clues to the early development of the universe? |
About PROLA | Terms and Conditions | Subscriptions | Search | Help
Content in PROLA © 2009 by The American Physical Society All rights reserved. PROLA™ is a trademark of The American Physical Society. Use of APS online journals implies that the user has read and agrees to the Terms and Conditions in the Subscription Agreement.