Gradient index phononic crystals and metamaterials

Nanophotonics

article

Yabin Jin¹  Bahram Djafari-Rouhani²  Daniel Torrent³ 

[1] School of Aerospace Engineering and Applied Mechanics, Tongji University;Institut d’Electronique, Département de Physique, Université de Lille;Institut de Noves Tecnologies de la Imatge, Universitat Jaume I

关键词: gradient index;    phononic crystals;    metamaterials;    lenses;    homogenization;   

DOI  :  10.1515/nanoph-2018-0227

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

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.

【 授权许可】

CC BY