Regular Article

Multi-resonance tunneling of acoustic waves in two-dimensional locally-resonant phononic crystals

¹ Jiangxi Electric Power Research Institute, Nanchang 330096, P.R. China
² School of Information Engineering, Baise University, Baise 533000, P.R. China
³ College of Electric and Information Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, P.R. China

^a e-mail: dkyyac2015@163.com

Received: 13 October 2016
Revised: 30 November 2016
Accepted: 9 January 2017
Published online: 3 March 2017

Abstract

Multi-resonance tunneling of acoustic waves through a two-dimensional phononic crystal (PC) is demonstrated by substituting dual Helmholtz resonators (DHRs) for acoustically-rigid scatterers in the PC. Due to the coupling of the incident waves with the acoustic multi-resonance modes of the DHRs, acoustic waves can tunnel through the PC at specific frequencies which lie inside the band gaps of the PC. This wave tunneling transmission can be further broadened by using the multilayer Helmholtz resonators. Thus, a PC consisting of an array of dual/multilayer Helmholtz resonators can serve as an acoustic band-pass filter, used to pick out acoustic waves with certain frequencies from noise.