Acoustic spoof surface waves control in corrugated surfaces and their applications

In recent research in the field of materials science, there have been attempts to identify the acoustic analogy of surface electromagnetic waves, particularly surface plasmon polaritons. We propose a chapter with detailed insight into acoustic surface wave propagating at the boundary between a fluid and a hard-grooved surface. The chapter will provide in-depth theoretical background and mathematical analysis of the spoof acoustic surface wave propagation behavior, the control and manipulation of the wave propagation properties and their applications. In the first part, we will provide the derivation and the mathematical analysis of the dispersion relation of the spoof acoustic surface wave, and we will describe control and manipulation of the surface acoustic waves by tailoring geometrical and parameters of the surrounding materials. The applications of the special behavior of the spoof acoustic waves in sound trapping, collimation of sound, gas sensing or acoustic lensing, will be provided. Moreover, a new type of acoustic waveguide, designed by adding an additional grooved surface to the existing system, will also be presented. The new waveguide opens up a new possible application for acoustic delay lines, modulators and sensors implementation.