Mardi 12 novembre 2024 à 11h00 --- en VISIO (ZOOM) ---
Abstract: Non-local metamaterials [1-4] exhibit significant departures from traditional local materials, enabling enhanced control over wave propagation and manipulation. By incorporating concepts from quantum fluid dynamics, we examine the emergence of roton-like excitations, which reveal novel behaviors in these structured media. The analysis employs advanced theoretical frameworks and computational models to demonstrate the impact of non-locality on mechanical and acoustic wave phenomena. Experimental validation is achieved through bespoke metamaterial designs, showcasing robust performance across various frequency ranges. Our findings suggest potential applications in cloaking, energy harvesting, and novel waveguiding technologies.
[1] Iglesias Martínez, Julio Andrés, et al. "Experimental observation of roton-like dispersion relations in metamaterials." Science advances 7.49 (2021): eabm2189.
[2] Chen, Yi, Muamer Kadic, and Martin Wegener. "Roton-like acoustical dispersion relations in 3D metamaterials." Nature communications 12.1 (2021): 3278.
[3] Wang, Ke, et al. "Nonlocal interaction engineering of 2D roton-like dispersion relations in acoustic and mechanical metamaterials." Communications Materials 3.1 (2022): 35.
[4] Chen, Yi, et al. "Nonlocal Cable‐Network Metamaterials." Advanced Materials 35.15 (2023): 2209988.