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Published on: August 27, 2013
The acoustic phase resonances and surface waves supported by a compound rigid grating
Joseph G Beadle1, Timothy Starkey2, Joseph A Dockrey2
1Electromagnetic and Acoustic Materials Group, Department of Physics and Astronomy, Physics Buidling, Stocker Road, University of Exeter, Exeter, EX4 4QL, UK. jgb206@exeter.ac.uk.
Abstract:
We study the radiative and bound acoustic modes supported by a rigid grating formed of three same-depth, narrow grooves per unit cell. One of the grooves is twice the width of the other two, forming a 'compound' grating. The structure supports so-called 'phase' resonances where the phase difference of the pressure field between the grooves on resonance varies by multiples of π. We explore the dispersion of these modes experimentally by monitoring the specularly reflected signal as a function of the angle of incidence. In addition, by near-field excitation, the dispersion of the non-radiative surface modes has been characterised. Our results are compared with the predictions of a finite element method model.
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