Berlin 2018 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 17: Poster Session I
DS 17.3: Poster
Dienstag, 13. März 2018, 18:15–20:15, Poster B
Coupled surface acoustic waves cavities — •André Luiz O. Bilobran1, Mauricio M. de Lima Jr.1, and Paulo V. Santos2 — 1University of Valencia - Institute of Materials Sciences, 46890 Paterna, Valencia (Spain) — 2Paul-Drude-Institut für Festkrperelektronik, Hausvogteiplatz 57, D-10117 Berlin (Germany)
A few years ago it was demonstrated that fundamental effects of quantum-wave transport (Bloch oscillations, Wannier-Stark ladders and Landau-Zener tunneling) can be studied with surface acoustic waves (SAWs) propagating in 1D coupled acoustic cavities. Posteriorly, it was shown that the cavities - a periodic arrangement of metal stripes within a surface acoustic delay line on piezoelectric substrate - can be electrically tuned by controlling the potential of the cavities' electrodes. Changing from floating stripes, i. e., electrically isolated, to short circuited ones, the acoustic field changes due to the screening of the piezoelectric potential underneath the stripes. Here, we discuss the two dimensional finite element model that we have developed. The model describes fairly well the behavior of such devices without any adjustment parameters. In it, the mechanics and electrostatics models are coupled to simulate the piezoelectricity. Using a frequency domain study the eigenfrequencies can be predicted with an accuracy of less then 1%. The transmission around them, in dB, is estimated with an error smaller than 10% for the short circuited devices, whereas for the floating ones the accuracy decreases. Moreover we calculate the variation of parameters such as the stress, the strain and the displacement throughout the structures.