Acoustic Metamaterials And Phononic Crystals Pdf File

acoustic metamaterials and phononic crystals pdf file

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Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. Zero-angle refraction of elastic waves in metamaterials has attracted attention for its extraordinary wave collimation properties.

Topologically protected zero refraction of elastic waves in pseudospin-Hall phononic crystals

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Tacticity in chiral phononic crystals

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application range of the acoustic metamaterial is wider. Band Structure Calculation Method of Phononic Crystal and Acoustic Metamaterials.


Acoustic Metamaterials And Phononic Crystals

Phononic crystals and acoustic metamaterials are periodic structures whose effective properties can be tailored at will to achieve extreme control on wave propagation. Their refractive index is obtained from the homogenization of the infinite periodic system, but it is possible to locally change the properties of a finite crystal in such a way that it results in an effective gradient of the refractive index. In such case the propagation of waves can be accurately described by means of ray theory, and different refractive devices can be designed in the framework of wave propagation in inhomogeneous media. In this paper we review the different devices that have been studied for the control of both bulk and guided acoustic waves based on graded phononic crystals. Phononic crystals and acoustic metamaterials enable to achieve innovative properties for the propagation of mechanical waves air-borne sound waves, water-borne acoustic waves, water waves, elastic waves, surface acoustic waves and Lamb waves inapproachable in natural materials.

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Acoustic filters and metamaterials have become essential components for elastic wave control in applications ranging from ultrasonics to noise abatement. Other devices have been designed in this field, emulating their electromagnetic counterparts. One such case is an acoustic diode or rectifier, which enables one-way wave transmission by breaking the wave equation-related reciprocity. Its achievement, however, has proved to be rather problematic, and current realizations display a number of shortcomings in terms of simplicity and versatility. Here, we present the design, fabrication and characterization of a device able to work as an acoustic diode, a switch and a transistor-like apparatus, exploiting symmetry-breaking nonlinear effects like harmonic generation and wave mixing, and the filtering capabilities of metamaterials.

Acoustic Metamaterials and Phononic Crystals

Skip to Main Content. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity. Use of this web site signifies your agreement to the terms and conditions. Acoustic metamaterials and phononic crystals: Towards the total control of the wave propagation Abstract: Classical waves, including elastic waves acoustic waves and electromagnetic waves optical waves and microwaves , are described by conventional wave-propagation functions.

An acoustic metamaterial , sonic crystal , or phononic crystal , is a material designed to control, direct, and manipulate sound waves or phonons in gases , liquids , and solids crystal lattices. They can be engineered to either transmit, or trap and amplify sound waves at certain frequencies. In the latter case, the material is an acoustic resonator.

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Abstract Phononic crystals have received some attention in the last decade due to their intrinsic property of band gaps.

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