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Negative refraction experiments with guided shear-horizontal waves in thin phononic crystal plates

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5 Author(s)
Min Kyung Lee ; School of Mechanical and Aerospace Engineering, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea ; Sik Ma, Pyung ; Lee, Il Kyu ; Hoe Woong Kim
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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.

Published in:

Applied Physics Letters  (Volume:98 ,  Issue: 1 )

Date of Publication:

Jan 2011

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