An acoustic metasurface and acoustic wave focusing device

Abstract

The present invention provides an acoustic metasurface and an acoustic wave focusing device. The acoustic metasurface includes: a plurality of first structural units and a plurality of second structural units, and the plurality of first structural units and the plurality of second structural units are connected to each other and located at On the same plane, the phase delay difference between the outgoing sound waves of the first structural unit and the second structural unit is 180 degrees, and the first structural unit and the second structural unit have the same transmittance to the incident sound wave; the first structural unit and the second structural unit The units respectively include: an upper plate and a lower plate connected in one piece, a plurality of rectangular protrusions are uniformly arranged on the lower surface of the upper plate; a first gap is arranged in the middle of two adjacent rectangular protrusions on the upper plate, and the lower plate The plate is provided with a second gap. The present invention can realize the function of adjusting different sound waves by adjusting the arrangement mode or arrangement order of the acoustic metasurface units.

Description

technical field [0001] The invention relates to the technical field of acoustic materials, in particular to an acoustic metasurface and an acoustic wave focusing device. Background technique [0002] In recent years, with the emergence of various acoustic devices, only using the acoustic properties of traditional materials can no longer meet the development needs of acoustic devices, and more and more acoustic metasurfaces (metamaterials) appear in the field of acoustic device manufacturing technology. Acoustic metasurfaces have special acoustic properties. Acoustic metasurfaces can satisfy the use of thin surfaces with subwavelength thickness to achieve the regulation of acoustic waves, but the structural components of existing acoustic metasurfaces cannot make the phase of incident acoustic waves The variation of the delay difference remains consistent, so that the incident sound waves cannot be regulated more effectively and flexibly. Contents of the invention [0003]...

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Problems solved by technology

[0002] In recent years, with the emergence of various acoustic devices, only using the acoustic properties of traditional materials can no longer meet the development needs of acoustic devices, and more and more acoustic metasurfaces (metamaterials) appear in the field of acoustic device manufacturing technology. Acoustic metasurfaces have special acoustic properties. Acoustic metasurfaces can satisfy the use of thin surfaces with subwavelength thickness to achieve the regulation of acoustic waves, but the structural components of existing acoustic metasurfaces cannot make the phase of incident acoustic waves The change of the delay difference remains consistent, so that the incident sound wave cannot be adjusted more effectively and flexibly

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