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Название: Metamaterials in Topological Acoustics
Автор: Sourav Banerjee
Издательство: CRC Press
Год: 2024
Страниц: 430
Язык: английский
Формат: pdf (true)
Размер: 38.4 MB

As an equivalent counterpart of topological research on photonics and condensed matter physics, acoustic metamaterials create an opportunity to explore the topological behaviors in phononics and physics of programmable acoustics. This book introduces the topological behavior of acoustics through the novel design of metamaterials. It provides valuable insight into acoustic metamaterials, from multidisciplinary fundamentals to cutting-edge research.

The word ‘meta’ is now more popular than ever due to social media activities. ‘Meta’ is a word originated from Greek which means ‘beyond’. Thus, a metamaterial is the material that by definition does not exist in the world and its features are beyond the capability of current materials. A metamaterial is artificially made material by researchers. While comprising various internal components and exploring various geometric patterns, counter-intuitive physics or phenomena were explored by the researchers in metamaterials. Generally speaking, metamaterials developed in acoustics are periodic in nature.

Periodic acoustic media can be one dimensional (1D), two dimensional (2D), or three dimensional (3D) in nature. Periodicities are created artificially along the respective directions in a metamaterial. Periodic media consist of periodically arranged geometric configurations of more than one material type. Hence, the media must have a host medium that creates a unit cell called ‘matrix’. There could be one or more constituent materials with material properties different from the constituent matrix (creating acoustic impedance mismatch) but housed inside the unit cell. Together they create a new unit cell with host and constituent materials. Once the unit cell is created, the unit cell could be repeated along any specific dimension to create a metamaterial with geometrical periodicity. The unit cell length in 1D, 2D, or 3D are called the lattice parameters in the respective directions. In this regard, phononic crystals must be discussed. Phononic crystals are also periodic. A specific material type is repeated in a host matrix, ensuring the acoustic impedance mismatch to achieve a specific behavior of acoustic or elastic wave propagation.

- Serves as a single resource on acoustic metamaterials

- Covers the fundamentals of classical mechanics, quantum mechanics, and state-of-the-art condensed matter physics principles so that topological acoustics can be easily understood by engineers

- Introduces topological behaviors with acoustics and elastic waves through quantum analogue Hall effects, quantum spin Hall effects, and quantum valley Hall effects and their applications

- Explains the pros and cons of different design methods and gives guidelines for selecting specific designs of acoustic metamaterials with specific topological behaviors

- Includes MATLAB code for numerical analysis of band structures

This book is written for graduate students, researchers, scientists, and professionals across materials, mechanical, civil, and aerospace engineering, and those who want to enhance their understanding and commence research in metamaterials.


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