| Full text | |
| Author(s): |
Beli, Danilo
;
Rosa, Matheus Inguaggiato Nora
;
De Marqui Jr, Carlos
;
Ruzzene, Massimo
Total Authors: 4
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW RESEARCH; v. 4, n. 4, p. 13-pg., 2022-10-17. |
| Abstract | |
In this paper, we present evidence of directional wave behavior, i.e., beaming and diffraction, along high-order rotational symmetries of quasicrystalline elastic metamaterial plates. These structures are obtained by placing pillars on an elastic plate following a particular rotational symmetry arrangement, such as eightfold and tenfold rotational symmetries, as enforced by a design procedure in reciprocal space. We estimate the dispersion properties of the waves propagating in the plates through Fourier transformation of transient wave fields. The procedure identifies, both numerically and experimentally, the existence of anisotropic bands characterized by high-energy density at isolated zones in reciprocal space that follow their higher order rotational symmetry. Specific directional behavior is showcased at the identified frequency bands, such as wave beaming (predicted in simulations and confirmed experimentally) and diffraction (exemplified only with numerical results). This paper expands the wave directionality phenomena beyond the symmetries of periodic configurations (e.g., fourfold and sixfold), and opens possibilities for applications involving the unusual high-order wave features of the quasicrystals (e.g., eightfold and tenfold) such as superior guiding, focusing, sensing, and imaging. (AU) | |
| FAPESP's process: | 19/22464-5 - Manipulating elastic waves using topological modes - phase I |
| Grantee: | Danilo Beli |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |
| FAPESP's process: | 18/18774-6 - Manipulating Mechanical Waves Using Programmable Periodic Structures |
| Grantee: | Danilo Beli |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 18/15894-0 - Periodic structure design and optimization for enhanced vibroacoustic performance: ENVIBRO |
| Grantee: | Carlos de Marqui Junior |
| Support Opportunities: | Research Projects - Thematic Grants |