WebDec 20, 2024 · By employing materials with strong resonant magneto-elastic coupling, the spin-wave non-reciprocity is transferred to magneto-acoustic waves. Non-reciprocal magnetic meta-materials developed under this program will be used to make and test acoustic wave circulators based on non-reciprocal, topologically protected chiral … WebIn this paper, a hybrid acoustic metamaterial consisting of chiral and anti-chiral ligaments is proposed. The bandgap properties of the hybrid chiral and anti-chiral structure with and without oscillator intercalation are calculated using Bloch’s theorem and the finite element method, and the structure is verified and evaluated to have good vibration attenuation …
Chiral Seismic Attenuation with Acoustic Metamaterials
WebAug 2, 2024 · The topological acoustic insulator with a chiral spiral structure provides a novel strategy for small acoustic devices with robust sound transmission. Topological … WebDec 13, 2024 · The scenario is akin to realizing nonreciprocal sound propagation in an elastic metamaterial via spatiotemporally modulating the stiffness [67–74], where the Brillouin-scattering process will lead to chiral acoustic wave transport. In this work we first derive the dispersion relation of the metamaterial waveguide by employing the … how is iberian ham made
Three-dimensional chiral meta-plate lattice structures for …
WebAug 31, 2024 · Nonreciprocal microwave devices are key components of communication platforms. Nonreciprocity can arise in chiral systems, where chirality refers to a fixed … The above physics can be extended to the 3D metamaterial with the unit cell shown in Fig. 3a. The unit cell consists of three chiral resonators mutually connected with tubes, as shown in Fig. 3b. The numerically calculated band structure of the metamaterial is shown in Fig. 3c. The lowest three bands derive … See more The longitudinal nature of airborne sound (\({{{{{\boldsymbol{\nabla }}}}}}\times {{{{{\bf{v}}}}}}=0\)) dictates that the velocity field v aligns with the direction of wave vector k in general. … See more The SOIs of transverse waves can also happen in real space. One intriguing phenomenon induced by such SOIs is the spin-dependent vortex generation in the scattering of subwavelength particles, which leads to the … See more The transverse sound near the \(\Gamma\) point in Fig. 3c can be described by an effective Hamiltonian \(H=-v{{{{{\bf{S}}}}}}\cdot {{{{{\bf{k}}}}}}\) with S being the spin-1 operator defined as \({({S}_{i})}_{{jk}}= … See more WebJan 14, 2024 · The dynamic behavior of chiral stiffness metamaterials is studied in this work. The equivalent stiffness parameters of chiral structures with different characteristic angles are obtained by a finite element method. A periodic chain composed of chiral cells is equivalent to a coupled spring-mass chain, which is solved theoretically and numerically … how is i-bond interest calculated