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Development of a dual temporal-spatial chirp method for the generation of broadband surface acoustic waves

Marc Duquennoy 1, 2 Dame Fall 1, 2 Mohammadi Ouaftouh 1, 2 Farouk Benmeddour 1, 2 Salah-Eddine Hebaz 1, 2 Nikolay Smagin 1, 2 Bogdan Piwakowski 1, 2 Frédéric Jenot 1, 2 
2 TPIA - IEMN - Transduction, Propagation et Imagerie Acoustique - IEMN
IEMN-DOAE - Institut d’Électronique, de Microélectronique et de Nanotechnologie - Département Opto-Acousto-Électronique - UMR 8520
Abstract : This study deals with the optimization of transducers for Rayleigh-type Surface Acoustic Waves (SAW) generation. These transducers are based on Interdigital Transducers (IDT) and are specifically developed to characterize properties of thin layers, coatings, and functional surfaces. In order to characterize these coatings and structures, it is necessary to work with wide bandwidths IDT operating in the high frequencies. Therefore, in this study a spatial chirp-based on an IDT are realized for wideband SAW generation. The use of impulse temporal excitation (Dirac-type negative pulse) leads to a wide band emitter excitation but with significantly limited SAW output amplitudes due to the piezoelectric crystal breakdown voltage. This limitation can be circumvented by applying a temporal chirp excitation corresponding in terms of frequency band and duration to the spatial chirp transducer configuration. This dual temporal-spatial chirp method was studied in the 20 to 125 MHz frequency range and allowed to obtain higher SAW displacement amplitudes with an excitation voltage lower than that of the impulse excitation.
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Submitted on : Thursday, March 3, 2022 - 11:49:28 AM
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Marc Duquennoy, Dame Fall, Mohammadi Ouaftouh, Farouk Benmeddour, Salah-Eddine Hebaz, et al.. Development of a dual temporal-spatial chirp method for the generation of broadband surface acoustic waves. 175th Meeting of the Acoustical Society of America, May 2018, Minneapolis, MN, United States. ⟨10.1121/1.5036050⟩. ⟨hal-03595633⟩



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