Elastic wave diode based on fluid-like characteristics and mode conversion effect

Abstract

The invention discloses an elastic wave diode based on fluid-like characteristics and a mode conversion effect, which comprises a fluid-like elastic metamaterial, a mode conversion elastic metamaterial and an isotropic background medium, wherein the fluid-like elastic metamaterial and the mode conversion elastic metamaterial are respectively obtained by periodically arranging unit cells along the longitudinal direction and the transverse direction of a plane where the unit cells are located, one side of the fluid-like elastic metamaterial is connected with the isotropic background medium used for inputting / outputting vibration signals, the other side of the fluid-like elastic metamaterial is connected with the mode conversion elastic metamaterial, and the other side of the mode conversion elastic metamaterial is connected with the isotropic background medium used for outputting / inputting the vibration signals. In a specific frequency range, only longitudinal waves can pass through the fluid-like elastic metamaterial, but transverse waves cannot pass through the fluid-like elastic metamaterial, the mode conversion elastic metamaterial can achieve conversion between the transverse waves and the longitudinal waves, and the problem that an existing acoustic diode is low in transmission efficiency can be solved.

Description

technical field [0001] The invention relates to the technical field of elastic wave non-reciprocal transmission, in particular to an elastic wave diode based on fluid-like characteristics and mode conversion effects. Background technique [0002] An acoustic diode is an acoustic rectification device, similar to the electric rectification effect of an electronic diode, it can realize the acoustic rectification effect. Acoustic diodes can be used in various important occasions that require special control of acoustic energy. For example, one-way mirrors can prevent ultrasonic sources from being interfered by retrospective waves or one-way acoustic barriers to block environmental noise from a single direction. In addition, acoustic diodes are expected to revolutionize key areas such as medical ultrasound therapy. [0003] At present, the acoustic diodes that realize the unidirectional transmission of sound waves / elastic waves can be mainly divided into two types. One is the no...

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Problems solved by technology

[0006] In order to solve the problems existing in the prior art, the object of the present invention is to provide an elastic wave diode based on fluid-like characteristics and mode conversion effects, and the diode of the present invention can solve the problem of low transmission efficiency of the current acoustic diode

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