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Title: Resonant excitation of coupled Rayleigh waves in a short and narrow fluid channel clad between two identical metal plates

Transmission of ultrasonic waves through a slit between two water immersed brass plates is studied for sub-wavelength plate thicknesses and slit apertures. Extraordinary high absorption is observed at discrete frequencies corresponding to resonant excitation of Rayleigh waves on the both sides of the channel. The coupling of the Rayleigh waves occurs through the fluid and the corresponding contribution to the dispersion has been theoretically derived and also experimentally confirmed. Symmetric and anti-symmetric modes are predicted but only the symmetric mode resonances have been observed. It follows from the dispersion equation that the coupled Rayleigh waves cannot be excited in a channel with apertures less than the critical one. The calculated critical aperture is in a good agreement with the measured acoustic spectra. These findings could be applied to design a broadband absorptive metamaterial.
Authors:
 [1] ;  [2] ;  [3] ;  [1]
  1. Universitat Politecnica de Valencia (Spain)
  2. CNRS and Univ. Joseph Fourier, Grenoble (France)
  3. Universitat Politecnica de Valencia (Spain); Univ. of North Texas, Denton, TX (United States)
Publication Date:
OSTI Identifier:
1076440
Grant/Contract Number:
FG02-06ER46312
Type:
Accepted Manuscript
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 1; Journal Issue: 4; Journal ID: ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)
Research Org:
Universitat Politècnica de València, Valencia (Spain)
Sponsoring Org:
USDOE Office of Science (SC); US Office of Naval Research
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS