Topological edge states of quasiperiodic elastic metasurfaces

• Main Authors: Marzani, A. (Author), Palermo, A. (Author), Pu, X. (Author)
• Format: Article
• Language: English
• Published: Academic Press 2022
• Subjects: Dynamic behaviors; Edge mode; Edge modes; Edge state; Energy harvesting; Mechanical oscillators; Metasurface; Quasi-periodic; Quasiperiodic structures; Quasi-periodic structures; Rayleigh waves; Synthetic dimension; Synthetic dimensions; Topological metamaterial; Topological metamaterials; Topological properties; Topology; Vibration analysis
• Online Access: View Fulltext in Publisher

 In this work, we investigate the dynamic behavior and the topological properties of quasiperiodic elastic metasurfaces, namely arrays of mechanical oscillators arranged over the free surface of a semi-infinite elastic medium according to a quasiperiodic spatial distribution. An ad-hoc multiple scattering formulation is developed to describe the dynamic interaction between Rayleigh waves and a generic array of surface resonators. The approach allows to calculate the spectrum of natural frequencies of the quasiperiodic metasurface which reveals a fractal distribution of the frequency gaps reminiscent of the Hofstadter butterfly. These gaps have nontrivial topological properties and can host Rayleigh-like edge modes. We demonstrate that such topologically protected edge modes can be driven from one boundary to the opposite of the array by a smooth variation of the phason, a parameter which modulates the geometry of the array. The proposed analytical framework could pave the way towards the design of devices for surface wave localization with applications in vibration mitigation and energy harvesting technologies. © 2022 Elsevier Ltd