Visible Extraordinary Transmission Based On Localized Resonances Of Acoustic Metamaterials

In the field of basic research and technology,various applications of various categories have taken advantage of the property that the transmission of sound will be affected by the medium,and the relevant information of the medium will be fed back.In other words,the transmission of sound will be affected by the medium.The influence of the medium it passes and the intervening objects is related to the inhomogeneity of the medium.The physical influence of sound on the substances and objects that interact with it is an area that is very worthy of attention and research.People speculate that sound is a kind of wave.The speculation of this phenomenon is not groundless,but derived from the observation of water waves.The basic concept of a wave is an oscillating disturbance,which ripples away from a certain source and does not transport too many valuable substances worth identifying during a relatively long-distance propagation process.Therefore,sound is also called sound wave,sound The propagation of sound waves is the movement of sound waves.In the early 17 th century,some related experimental results showed that sound is air movement produced by a single note emitted by a vibrating object.Air is also vibrating,and the frequency of its vibration is the same as that of the object.Since the propagation of sound waves interacts with the objects it passes through and derives some physical properties,and will be widely used from this,the study of the structure of the object is very necessary.This type of object is also called acoustically related.s material.Some traditional acoustic materials such as porous media and micro-perforated plates realize the absorption of sound waves,and use the viscous dissipation and heat conduction of the fluid-solid interface to express the realization of such a performance through microscopic geometric parameters.In recent years,the emergence of acoustic metamaterials has aroused people's strong interest in acoustic wave related research.This material achieves special functions that cannot be achieved by the original materials in general nature,such as acoustic super-resolution imaging,sound field stealth,and sound absorption.Local resonance and its geometric and symmetry constraints provide ideas for measuring the absorption properties of various metamaterials,which can achieve absorption spectra of sub-wavelength scale structures that have not been possible before.These structures include decorative film resonators,degenerate resonators,hybrid resonators,and coiled Fabry-Pérot and Helmholtz resonators.Acoustic metasurface is a new type of two-dimensional artificial structure material,which is a part of acoustic metamaterial.Compared with traditional three-dimensional acoustic metamaterials,two-dimensional acoustic metasurfaces have the advantages of small size and thin thickness,and will play a role that traditional acoustic metamaterials cannot achieve in some practical applications.This article introduces a metasurface that can greatly improve the transmission performance of sound waves in the sub-wavelength range,while maintaining its transparency and airtight properties.Glass is a very common material,generally known as a sound insulation material,but there are few reports on its application and properties in transmission.In this paper,using the principle of the resonance of the glass sheet and the rigid frame,the almost total transmission phenomenon of the 0.3 mm thick glass sheet at a specific frequency is measured,and the transmission of the air layer of different thicknesses between the double and multi-layer glass sheets at multiple frequencies at the same time is measured.,And analyze its principle through finite element simulation,laying the foundation for the realization of a fully enclosed visualized super-transmissive acoustic material.It can actually be used on the firefighter's transparent mask.Under the condition of effectively blocking the external smoke and not obstructing the firefighter's sight,it can achieve the maximum penetration of certain frequency sound waves;the microphone hole of the mobile phone can be attached to this kind of material,Which not only ensures the airtightness of the mobile phone,but also realizes the full transmission of sound.Compared with the current state of the art,this initially conceived passive metasurface makes full use of the resonance of the glass plate,especially without using any complex or expensive materials.We provide the design,numerical simulation and experimental demonstration of the Decorated Air-proof Window(DAW)for this kind of super-surface,and analyze the physical mechanism behind it.In addition,we also proved that more transmission peaks can be achieved by introducing the multilayer resonant coupling of the decorative window.This metasurface has many potential applications,because some occasions require the maximum transmission of sound and visible light without any ventilation.