Annular interdigital transducer focuses piezoelectric surface waves to a single point

Details Annular interdigital transducer focuses piezoelectric surface waves to a single point Annular interdigital transducer focuses piezoelectric surface waves to a single point

2007-12-23

arxiv.org/abs/0712.3899v1

Physics

Condensed Matter

Materials Science

Scientific paper

We propose and demonstrate experimentally the concept of the annular interdigital transducer that focuses acoustic waves on the surface of a piezoelectric material to a single, diffraction-limited, spot. The shape of the transducing fingers follows the wave surface. Experiments conducted on lithium niobate substrates evidence that the generated surface waves converge to the center of the transducer, producing a spot that shows a large concentration of acoustic energy. This concept is of practical significance to design new intense microacoustic sources, for instance for enhanced acouto-optical interactions.

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