Experimental observation of locally-resonant and Bragg band gaps for surface guided waves in a phononic crystal of pillars

By Y. Achaoui, A. Khelif, S. Benchabane, L. Robert, V. Laude. 2011

247 citations recorded by the source corpus.

We report on the experimental study of the propagation of surface guided waves in a periodic arrangement of pillars on a semi-infinite medium. Samples composed of nickel pillars grown on a lithium niobate substrate were prepared and wide bandwidth transducers were used for the electrical generation of surface elastic waves. We identify a complete band gap for surface guided waves appearing at frequencies markedly lower than the Bragg band gap. Using optical measurements of the surface vibrations and by comparison with a finite element model, we argue that the low frequency band gap arises because of local resonances in the pillars. When resonance is reached, the acoustic energy is confined inside the pillars and transmission through the array is strongly reduced. At higher frequencies and inside the Bragg band gap, the incident surface elastic waves are almost completely reflected and the observed exponential decay of the transmission is similar to the case of phononic crystals made of holes in a substrate.

Subfields: Biomedical Engineering, Computer Vision and Pattern Recognition, Mechanics of Materials

View Paper: https://www.semanticscholar.org/paper/27fa47db021ee7ed35d196819b01a5e2282c6db0

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In Biomedical Engineering

In Computer Vision and Pattern Recognition

In Mechanics of Materials

Citations in the corpus

Coupling local resonance with Bragg band gaps in single-phase mechanical metamaterials (2017, background): “These conclusions are also valid for surface guided waves [26] and acoustic waves in PCs with gas bubbles [27].”
Local resonance and Bragg bandgaps in sandwich beams containing periodically inserted resonators (2015, background): “[10] showed the presence of local resonance bandgaps at low frequencies and Bragg bandgaps at high frequencies for surface guided waves in a lithium niobate substrate with nickel pillars, while Bretagne et al.”
Tailoring Structure‐Borne Sound through Bandgap Engineering in Phononic Crystals and Metamaterials: A Comprehensive Review (2022, methodology): “[97] used an optical measurement technique to characterize the vibration of individual pillars interacting with Rayleigh waves, and observed the generated LR BG by a square lattice of cylindrical nickel pillars”