Waveguide for Lamb Waves Based on Whispering-Gallery Mode

International audience; We proposed three kinds of waveguides namely straight waveguide, Z-shaped waveguide and Pi-shaped waveguide in an otherwise perfect phononic crystal. We analyzed numerically the transmissivity and the displacement field distribution behind the waveguides. We demonstrated that these three waveguides are efficient for guiding the lowest-order antisymmetric Lamb mode (A 0), based on the whispering-gallery modes in the hollow pillars that comprise the route line. Our approach provides a simple method to design sophisticated waveguides.