Acoustoelectric shared coding metamaterial and application thereof to cloaking device

Abstract

The invention discloses an acoustoelectric shared coding metamaterial and an application thereof to a cloaking device. The metamaterial is formed by periodically arranging n-bit acoustoelectric sharedcoding units in a two-dimensional plane according to pre-designed coding states, the number of the coding states is 2n, and the phase difference is degree; a basic unit structure of each acoustoelectric shared coding unit is an aluminum helmholtz resonator, and electromagnetic waves and sound waves which are vertically incident are subjected to reflection regulation by adjusting geometrical parameters of the acoustoelectric shared coding units; and the metamaterial is used as a surface material of the cloaking device. The metamaterial is designed based on a single material, is simple in structure and easy to process, can perform beam deflection, beam forming and abnormal reflection on the sound waves and the electromagnetic waves at the same time, and can also be used for reducing the scattering cross section of a radar or a sonar of a target; the metamaterial can be regarded as a combination of an electromagnetic reflection array antenna and a sonar array, and has a potential application prospect in safety detection or target detection of a few complex scenes.

Description

technical field [0001] The invention relates to a new type of artificial material, in particular to a coded metamaterial capable of simultaneously controlling an acoustic field and an electromagnetic field, and also relates to the application of an acoustic-electric shared coded metamaterial in a stealth device. Background technique [0002] Metamaterials are composed of periodic and non-periodic arrangements of sub-wavelength unit structures, and their original purpose is to imitate the arrangement of natural materials to achieve some properties that cannot be achieved by natural materials. Early metamaterials were introduced from the control of electromagnetic waves, and they were all three-dimensional analog structures. It uses the interaction between the incident electromagnetic wave and the unit to regulate the propagation form of the electromagnetic wave. In 2011, Capasso et al. proposed the generalized Snell's law, which theoretically explained that when a discontinu...

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Problems solved by technology

[0003] The metasurfaces mentioned above are all regulated for the same physical field, that is, the electromagnetic metasurface can only regulate the behavior of electromagnetic waves, while the acoustic metasurface can only manipulate the transmission of the sound field.

However, some previously proposed devices that can control the acoustic field and the electromagnetic field at the same time, because different materials need to be used to respond to different fields, are usually very complicated to manufacture, and the control effect that can be achieved is limited.

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