Generation and detection of ultrasonic Lamb waves in a thin deposited film by using interdigital transducers
- 15 November 1983
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 43 (10), 917-919
- https://doi.org/10.1063/1.94179
Abstract
Interdigital transducers (IDT’s) have been used to generate and detect ultrasonic Lamb waves in a composite Cu(3 μm)-ZnO (0.45 μm) film that is much thinner than the acoustic wavelength in a bulk material. rf pulses of 29.0 and 1.31 MHz are applied to one of the pair of IDT’s with 140-μm period, giving rise to a nondispersive quasi-symmetric mode of phase velocity 4170 m/s and a dispersive quasi-antisymmetric mode having a phase velocity of 184 m/s and a group velocity of 362 m/s, respectively. Possible applications to electronic signal processing and material studies are described.Keywords
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