Collimation and enhancement of elastic transverse waves in two-dimensional solid phononic crystals

被引：25

作者：

Liu, Wei ^{[1
]}

Su, Xianyue

机构：

[1] Peking Univ, LTCS, Beijing 100871, Peoples R China

来源：

PHYSICS LETTERS A | 2010年 / 374卷 / 29期

基金：

中国国家自然科学基金;

关键词：

2D solid phononic crystal; Collimation; Equifrequency contour; BAND-STRUCTURE;

D O I：

10.1016/j.physleta.2010.05.016

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In this Letter, we numerically investigate the propagation characteristics of elastic transverse waves emitted by line sources embedded inside two-dimensional (2D) solid phononic crystals (PCs). The results show that collimation and enhancement of elastic transverse waves can be achieved at the band edge frequencies. We find that the collimation effect originates from the flat equifrequency contours (EFCs) at the band edge of appropriately designed 2D solid PCs. It is shown that, in addition to geometric symmetry, appropriate constituent material combination is essential to obtain flat EFCs at the band edge. A highly directional and enhanced elastic transverse wave source with a half power angular width of only 5.6 degrees and an enhancement factor of 530 is realized simply by utilizing a finite-size 2D solid PC structure. (C) 2010 Elsevier B.V. All rights reserved.

引用

收藏

页码：2968 / 2971

页数：4

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