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(a) Schematic cross section of the sample (not to scale). (b) Signal waveform at the wavenumber (acoustic wavelength ). The spectrum of the acoustic oscillations is shown in the inset.
(a) Measured (solid circles) and calculated (lines) dispersion curves of the four lowest surface acoustic modes of the structure. (b) A detailed view of the “plateau” in the dispersion of the lowest mode.
Simulated dispersion curves of the lowest mode for different values of the transverse-to-longitudinal velocity ratio of the polymer layer. (a) is varied at fixed ; (b) is varied at fixed . The fixed velocity values as well as all other model parameters are the same as for the simulations presented in Fig. 2 .
Dispersion of the two lowest modes for a layer with , , and of thickness on a silicon substrate versus the product of the wavenumber and the layer thickness.
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