Extraordinary acoustic reflection enhancement by acoustically-transparent thin plates

Abstract

We report an observation of the extraordinary high reflection of acoustic waves in water by thin epoxy plates partitioned by subwavelength cuts, whereas such plates without structure are acoustically-transparent as the acoustic properties of epoxy are close to water. It is demonstrated that this exotic phenomenon results from the resonant excitation of the local modes within the individual pieces derived by the cuts. The experiment agrees well with the theory.

11 pages, 5 figures

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• Colloquium: Light scattering by particle and hole arrays
• Diacritical study of light, electrons, and sound scattering by particles and holes

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