Publication

Acoustic Metasurface

Hervé Lissek, Sami Driss Karkar, Seyyed Hussein Seyyed Esfahlani
2015
Conference Papers

Abstract

Metasurfaces have gained fame for their ability to control the transmitted and reflected phase front of waves. Here, we introduce a reflector-type acoustic metasurface designed in such a way to control the phase front of reflected sound waves. The proposed structure can be considered an acoustic counterpart of the electromagnetic reflectarray antenna. This structure is very thin (lambda=30), and possesses sub-wavelength unit-cells.

Official source

https://infoscience.epfl.ch/entities/publication/92fc8768-1d29-4afe-99e2-db43c2196490

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Hervé Lissek, Sami Driss Karkar, Seyyed Hussein Seyyed Esfahlani
2015
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/92fc8768-1d29-4afe-99e2-db43c2196490

About this result

Related concepts (14)

Metamaterial

A metamaterial (from the Greek word μετά meta, meaning "beyond" or "after", and the Latin word materia, meaning "matter" or "material") is any material engineered to have a property that is rarely observed in naturally occurring materials. They are made from assemblies of multiple elements fashioned from composite materials such as metals and plastics. These materials are usually arranged in repeating patterns, at scales that are smaller than the wavelengths of the phenomena they influence.

Specular reflection

Specular reflection, or regular reflection, is the mirror-like reflection of waves, such as light, from a surface. The law of reflection states that a reflected ray of light emerges from the reflecting surface at the same angle to the surface normal as the incident ray, but on the opposing side of the surface normal in the plane formed by the incident and reflected rays. This behavior was first described by Hero of Alexandria (AD c. 10–70). Later, Alhazen gave a complete statement of the law of reflection.

Acoustic metamaterial

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). Sound wave control is accomplished through manipulating parameters such as the bulk modulus β, density ρ, and chirality. 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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