Gradient-index phononic crystals

被引：301

作者：

Lin, Sz-Chin Steven ^{[1
]}

Huang, Tony Jun ^{[1
]}

Sun, Jia-Hong ^{[2
]}

Wu, Tsung-Tsong ^{[2
]}

机构：

[1] Penn State Univ, Dept Engn Sci & Mech, University Pk, PA 16802 USA

[2] Natl Taiwan Univ, Inst Appl Mech, Taipei 106, Taiwan

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 09期

基金：

美国国家科学基金会;

关键词：

acoustic wave propagation; elastic moduli; finite difference time-domain analysis; gradient index optics; photonic crystals; refractive index; SURFACE ACOUSTIC-WAVES; ULTRASOUND;

D O I：

10.1103/PhysRevB.79.094302

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We designed and characterized a two-dimensional, gradient-index phononic crystal (GRIN PC) to control the propagation of acoustic waves. The GRIN PC was composed of solid cylinders arranged in a square lattice and immersed in an epoxy. The refractive index along the direction transverse to the phononic propagation was designated as a hyperbolic secant gradient distribution. This distribution was modulated by means of the density and elastic moduli of the cylinders. The effective refractive indices in each row of the GRIN PC were determined from band diagrams obtained via a plane-wave expansion method. The acoustic wave propagation was numerically investigated by a finite-difference time-domain method, and the results were compared to the analytical beam trajectories derived from the hyperbolic secant profile. These results show that the GRIN PC allows acoustic focusing over a wide range of working frequencies, making it suitable for applications such as flat acoustic lenses and couplers.

引用

页数：6

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