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Journal Articles Applied Physics Letters Year : 2008

Subwavelength focusing of surface acoustic waves generated by an annular interdigital transducer

Abstract

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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Dates and versions

hal-00201067 , version 1 (23-12-2007)

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Vincent Laude, Davy Gérard, Naima Khelfaoui, Carlos F. Jerez-Hanckes, Sarah Benchabane, et al.. Subwavelength focusing of surface acoustic waves generated by an annular interdigital transducer. Applied Physics Letters, 2008, 92, pp.094104. ⟨10.1063/1.2891055⟩. ⟨hal-00201067⟩
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