Beating resonance patterns and extreme power flux skewing in anisotropic elastic plates

• DOI: 10.1126/sciadv.adk6846
• Publication Date: 2023-12-20T18:58:40Z
• Authors: Daniel A. Kiefer; Sylvain Mezil; Claire Prada
• Keywords: Lamb waves; Wave vector; Love wave

Elastic waves in anisotropic media can exhibit a power flux that is not collinear with the wave vector. This has notable consequences for guided plate. Through laser-ultrasonic experiments, we evidence remarkable phenomena due to slow single-crystal silicon wafer. Waves exhibiting orthogonal their vector are identified. A pulsed line source excites these reveals packet radiated parallel line. Furthermore, there exist precisely eight plane zero flux. These so-called zero-group-velocity modes oriented along crystal's principal axes. Time acts as filter wave-vector domain selects modes. Thus, point leads beating resonance patterns moving nodal curves on surface of infinite We observe this pattern it emerges naturally after excitation.