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(a) Unit cell scheme and (b) photograph of the crystal used in the experimental setup.
Transverse profile of the ultrasonic beam measured at (a) 3 mm from the transducer, (b) at 115 mm from the transducer in free propagation, and (c) at the crystal output located at 115 mm from the transducer, after propagating through the crystal.
Beam width vs frequency. Dots represent the experimental points with the corresponding dispersion bars and the analytical fit (see text below) is depicted by the continuous line.
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