Effects of Dissipation on Propagation of Surface Electromagnetic and Acoustic Waves Page: 3
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In the second part (chapters 4 & 5) of the dissertation, I discuss an interesting
effect of extraordinary absorption of acoustic energy due to resonant excitation of Rayleigh
waves in a narrow water channel clad between two metal plates. Starting from the elastic
properties of the metal plates, I derive a dispersion equation that gives resonant
frequencies, which coincide with those observed in the experiment that was performed by
Wave Phenomena Group at Polytechnic University of Valencia, Spain. Two eigenmodes
with different polarizations and phase velocities are obtained from the dispersion equation.
At certain critical aperture of the channel, an interesting cutoff effect, which is unusual for
an acoustic wave, is observed for one of the eigenmodes with symmetric distribution of the
pressure field. The theoretical prediction of the coupling and synchronization of Rayleigh
waves strongly supports the experimentally measured shift of the resonant frequencies in
the transmission spectra with channel aperture. The observed high level of absorption may
find applications in designing metamaterial acoustic absorbers.
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Nagaraj, Nagaraj. Effects of Dissipation on Propagation of Surface Electromagnetic and Acoustic Waves, dissertation, May 2012; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc115126/m1/3/: accessed March 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; .