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Abstract
This paper presents the experimental evidence of negative refraction of a guided ultrasonic shear-horizontal wave in a phononic crystal plate, a thin aluminum plate with periodically spaced circular holes. Unlike bulk wave experiments, guided-wave experiments allow the full measurement of negatively refracted waves propagating into a base aluminum plate from the phononic crystal plate. The present guided-wave experiments were conducted with the planar solenoid array-type orientation-adjustable patch-type magnetostrictive transducer having good beam directivity. An effective technique to estimate negative refraction angles from the experimental measurements is suggested, yielding values in good agreement with theoretically calculated angles.
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