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

Vincent Laude, Davy Gérard, Naima Khelfaoui, Carlos F. Jerez-Hanckes, Sarah Benchabane, Abdelkrim Khelif

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

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 acousto-optical interactions.

Original languageEnglish
Article number094104
JournalApplied Physics Letters
Volume92
Issue number9
DOIs
StatePublished - 2008
Externally publishedYes

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