Local resonances in phononic crystals and in random arrangements of pillars on a surface

Younes Achaoui (1) , Vincent Laude (1) , Sarah Benchabane (1) , Abdelkrim Khelif (1)

1 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)

The propagation of surface acoustic waves in two-dimensional phononic crystals of pillars on a surface is investigated experimentally for hexagonal and honeycomb lattice symmetries. A random array of pillars is also compared to the periodic phononic crystals. Taking into account that the geometrical and physical characteristics of the pillars are the same in all cases, it is shown that the locally resonant band gap in the low frequency range is almost independent of periodicity and resilient to randomness. In contrast, the Bragg band gap disappears with the random array.

Domaines: Micro et nanotechnologies/Microélectronique

Younes Achaoui, Vincent Laude, Sarah Benchabane, Abdelkrim Khelif. Local resonances in phononic crystals and in random arrangements of pillars on a surface. Journal of Applied Physics, 2013, 114, pp.104503. ⟨10.1063/1.4820928⟩. ⟨hal-00877360⟩