A practical and highly sensitive acoustic Michelson interferometer with a small form factor is introduced. It involves two different types of phononic crystals composed steel rods in water acting as medium for self-collimated waves mirrors the reference sample beams, well beam splitter formed by modified scatterers arranged diagonally. Finite-element method simulations are employed to demonstra...

Topological phases, including the conventional first-order and higher-order topological insulators semimetals, have emerged as a thriving topic in fields of condensed-matter physics material science. Usually, insulator is characterized by fixed order invariant exhibits associated bulk-boundary correspondence. Here, we realize new type bilayer phononic crystal, which hosts simultaneously second-...

A design method of a phononic crystal structure with local effect is introduced, and the mechanism influencing factors (elastic modulus, density, layer thickness) bandgap are analyzed. The finite element used to calculate eigenfrequency. first width accounts for more than 98% frequency below 20 000 Hz. Two kinds materials different wave velocities arranged periodically form two-dimensional stru...

The acoustically driven spin-wave resonance in a phononic-crystal cavity is numerically investigated. designed enables confinement of gigahertz vibrations wavelength-scale point-defect structure and sustains variety modes. Inhomogeneous strain distributions the modes modify magnetostrictive coupling excitation susceptible to an external-field orientation. In particular, monopole-like mode havin...

It is shown that it is possible to obtain complete planar phononic bandgaps in square and hexagonal (honeycomb) lattice phononic crystals formed by etching a periodic array of circular holes in a thin silicon plate (or membrane). Also, better bandgap properties are obtained using the hexagonal lattice structure; and, with practical structure sizes, it is possible-to-obtain a gap-to-midgap ratio...