Elastic Wave Packets Crossing a Space-Time Interface
The interaction between waves and evolving media challenges traditional conservation laws. We experimentally investigate the behavior of elastic wave packets crossing a moving interface that separates two media with distinct propagation properties, observing the noninvariance of wavelength and frequency. Our experimental setup employs an elastic strip whose local stretching can be dynamically altered by pulling one end at a constant velocity. By demonstrating that this dynamic configuration creates a spatiotemporal interface traveling along the strip, we confirm theoretical predictions regarding observed shifts when a wave packet crosses this interface.
Authors
- Fabrice Lemoult (ORCID: https://orcid.org/0000-0001-9757-0760)
- Antonin Eddi (ORCID: https://orcid.org/0000-0001-5097-5656)
- Alexandre Delory (ORCID: https://orcid.org/0000-0002-7623-5856)
- Claire Prada (ORCID: https://orcid.org/0000-0002-2500-1099)
- Mathias Fink (ORCID: https://orcid.org/0000-0002-8494-7562)
- Maxime Lanoy (ORCID: https://orcid.org/0000-0003-0467-0725)
Institutions
- Institut Langevin (FR)
- Le Mans Université (FR)
- Physique et Mécanique des Milieux Hétérogènes (FR)
- Laboratoire d'Acoustique de l'Université du Mans (FR)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2024-12-27
- DOI
- https://doi.org/10.1103/physrevlett.133.267201
- Citations
- 7
- Primary Topic
- Nonlinear Photonic Systems
- Type
- article
- Field-Weighted Citation Impact
- 1.97
Funders
- Simons Foundation
- Direction Générale de l’Armement