Dual-band acoustic wave beam splitter based on acoustic valley Hall effect

Abstract

The invention relates to the technical field of fluid acoustic communication, and discloses a dual-band acoustic wave beam splitter based on an acoustic valley Hall effect, which comprises a matrix with air as a medium and a scatterer with an acoustic rigid material as a medium, and simulates the quantum valley Hall effect in acoustics by using a graphene-like cellular two-dimensional phononic crystal structure device. Because the primitive cell structure of the photonic crystal keeps C6 symmetry, two linear Dirac degeneracy points exist at a K point of a Brillouin region at the same time. Commercial simulation software is utilized to obtain an band structure of the two-dimensional cellular photonic crystal, the symmetry in the photonic crystal is adjusted, an extreme point-valley in an energy band is obtained and serves as a carrier of information, and two photonic crystal waveguide structures with different topological states are combined, so that a boundary state with backscattering suppression and one-way transmission characteristics is realized, and a dual-band acoustic wave beam splitter device is realized by utilizing the unidirectionality of the boundary state. The method is low in cost and easy to manufacture, and has the characteristic of inhibiting acoustic wave backscattering and good robustness.

Description

technical field [0001] The invention relates to the technical field of fluid acoustic communication, in particular to a dual-band acoustic beam splitting device based on the acoustic valley Hall effect. Background technique [0002] In recent years, the demand for acoustic communication and acoustic detection in special occasions has been strong and developed rapidly, but it has also brought some constraints: the traditional acoustic material characteristics in acoustic wave communication devices limit the way to regulate sound waves. Nowadays, the application of topological materials in acoustic integrated devices has achieved great development, and has become the focus of many researchers. It mainly benefits from the various dispersion relations and singular characteristics in topological materials. Through the purposeful design of the energy band structure of artificial crystals-phononic crystals, the high localization, broadband, multi-band and low loss of sound waves in...

AI Technical Summary

Problems solved by technology

[0004] At present, in the research field of acoustic valley Hall topological insulators, most researchers only focus on one working frequency band, limiting multi-band communication and other multifunctional application scenarios

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