Abstract
We report that the transmission of incident ultrasonic waves through an impedance-mismatched brass plate can be drastically enhanced by single-sided periodic gratings. Using Schlieren imaging, we experimentally demonstrated the phenomenon of extraordinary acoustic transmission through the stiff, structured plate. Using a numerical model, we revealed that this phenomenon arises from the resonant excitation of the intrinsic A0 mode in this structure. We discussed the possible application of this structure as a patch to enhance ultrasound transmission in medical instruments.
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