Superlensing effect for surface acoustic waves in a pillar-based phononic crystal with negative refractive index

被引：44

作者：

Addouche, Mahmoud ^{[1
]}

Al-Lethawe, Mohammed A. ^{[1
]}

Choujaa, Abdelkrim ^{[1
]}

Khelif, Abdelkrim ^{[1
]}

机构：

[1] Univ Franche Comte, CNRS, Inst FEMTO ST, F-25044 Besancon, France

来源：

APPLIED PHYSICS LETTERS | 2014年 / 105卷 / 02期

关键词：

Acoustic surface wave devices - Acoustic waves - Acoustic resonators - Geometry - Acoustic wave propagation - Refraction - Refractive index;

D O I：

10.1063/1.4890378

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We demonstrate super resolution imaging for surface acoustic waves using a phononic structure displaying negative refractive index. This phononic structure is made of a monolithic square lattice of cylindrical pillars standing on a semi-infinite medium. The pillars act as acoustic resonator and induce a surface propagating wave with unusual dispersion. We found, under specific geometrical parameters, one propagating mode that exhibits negative refraction effect with negative effective index close to -1. Furthermore, a flat lens with finite number of pillars is designed to allow the focusing of an acoustic point source into an image with a resolution of lambda/3, overcoming the Rayleigh diffraction limit. (C) 2014 AIP Publishing LLC.

引用

页数：4