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A simple fabrication technique was developed to produce self-focused high frequency single element transducers with sputtered zinc oxide (ZnO) crystal films. The novelty of this technique lies in that the ZnO film can be sputtered directly onto a curved substrate. Two transducers were fabricated by sputtering an 18 mum thick ZnO layer on 2 and 3 mm diameter aluminum rods with ends shaped and polished...
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