Tunable multidispersive bands of inductive origin in piezoelectric phononic plates

K. Mekrache (1) , R. Sainidou (1) , P. Rembert (1) , N. Stefanou , Bruno Morvan (1)

1 LOMC - Laboratoire Ondes et Milieux Complexes

A variety of multidispersive, localized or extended in frequency, bands, induced by inductance-based external electric circuits in piezoelectric phononic plates, is studied both theoretically and experimentally in this work. Their origin, tightly related to an equivalent LC-circuit behavior is analyzed in detail and their interaction with the Lamb-like guided modes of the plate is also discussed. These bands, easily tuned by the choice of the parameters of the external electric circuitry lead to a non-destructive, real-time control of the dispersion characteristics of these structures. Our device and analysis can find application in improvement of surface acoustic wave (SAW) components, by offering additional degrees of freedom. 78 automatization, combined to a robust and promising sig-79 nal processing technique leading to a finer analysis of the 80 experimental data. Usually, surface acoustic wave (SAW) 81 devices offer only input and output ports, restricting the 82 analysis exclusively in the frequency domain. Our de-83 vice, allows to probe the surface waves along their path, 84 thus offering the wavevector projection along this path 85 as an additional degrees of freedom, which could provide 86 an improvement in the domain of SAW components. 87 The paper is organized as follows. In Sec. II we present 88 the general characteristics of the materials and structures 89 considered in this study, and provide all necessary details 90 concerning the experimental setup employed for our mea-91 surements, as well as the methods and techniques used in 92 the analysis of the experimental data and in the numer-93 ical calculations, that follow in Sec. III. For the different structures under study, the analysis of their dispersion 95 properties, strongly influenced by the external loads, in 96 terms of underlying physical mechanisms responsible for 97 these effects, as well as in comparison with their experi-98 mental observation, constitute the main part of Sec. III, 99 before concluding the paper in Sec. IV.

Domaines: Sciences de l'ingénieur [physics]; Acoustique [physics.class-ph]

K. Mekrache, R. Sainidou, P. Rembert, N. Stefanou, Bruno Morvan. Tunable multidispersive bands of inductive origin in piezoelectric phononic plates. Journal of Applied Physics, 2021, 130 (19), pp.195106. ⟨10.1063/5.0065184⟩. ⟨hal-03479298⟩