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Polar metamaterials: A new outlook on resonance for cloaking applications
- Source :
- Phys. Rev. Lett. 124, 084301 (2020)
- Publication Year :
- 2019
-
Abstract
- Rotationally resonant metamaterials are leveraged to answer a longstanding question regarding the existence of transformation-invariant elastic materials and the ad-hoc possibility of transformationbased passive cloaking in full plane elastodynamics. Combined with tailored lattice geometries, rotational resonance is found to induce a polar and chiral behavior; that is a behavior lacking stress and mirror symmetries, respectively. The central, and simple, idea is that a population of rotating resonators can exert a density of body torques strong enough to modify the balance of angular momentum on which hang these symmetries. The obtained polar metamaterials are used as building blocks of a cloaking device. Numerical tests show satisfactory cloaking performance under pressure and shear probing waves, further coupled through a free boundary. The work sheds new light on the phenomenon of resonance in metamaterials and should help put transformation elastodynamics on equal footing with transformation acoustics and optics.
- Subjects :
- Physics - Applied Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 124, 084301 (2020)
- Publication Type :
- Report
- Accession number :
- edsarx.1909.12437
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.124.084301