Through theoretical analysis and numerical calculation, it is found that the textured surface of a perfect rigid body whose groove height is sufficiently large can support multiple modes of propagating spoof surface acoustic waves (SSAWs). Dispersion curves and group velocities/refractive index versus height and width of the groove are depicted for infinitely thick perfect rigid body to make a thoroughly inquiry into the multiband transmission of SSAWs. We also give the dispersion relations of samples with finite thickness which are more practical to realize, and the corresponding experimental results are in accordance with simulated results. Theoretical, simulated, and measured acoustic pressure field distributions are given to further illustrate the characteristics of different modes. Our work could have implications for applications such as acoustic filter design and energy harvesting.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics