Scholte-Stoneley waves on 2D phononic crystal gratings

Scholte-Stoneley waves (SSW) propagate at the interface of a fluid medium and a solid medium. Their velocity is smaller than the transverse and longitudinal velocities in the solid, and smaller than the sound velocity in the fluid. We consider in this work 2D silicon-water phononic crystals (PC) and study bulk wave to SSW modal conversion at the PC surface. We report on a new theoretical and experimental investigation of conditions for Scholte-Stoneley waves generation on 2D corrugated silicon plate. The obtained experimental results confirm the SSW generation through diffraction. They appear at cut-off frequencies for diffraction orders from the classical grating law.