调制二维声子晶体中自准直声波束的声 Fano 共振。

Modulating acoustic Fano resonance of self-collimated sound beams in two dimensional sonic crystals.

机构信息

Key Laboratory of Modern Acoustics, Department of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China; School of Electronic & Information Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China.

Key Laboratory of Modern Acoustics, Department of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.

出版信息

Ultrasonics. 2019 Jan;91:129-133. doi: 10.1016/j.ultras.2018.08.001. Epub 2018 Aug 4.

DOI:10.1016/j.ultras.2018.08.001

PMID:30107288

Abstract

Controlling the lineshape of Fano resonance has great potential applications. Here we propose a type of acoustic Fano resonator, which is composed of a multi-layer zigzag line defects (ZLDs) sandwiched by double-layer zigzag steel rods in two-dimensional sonic crystals (SCs). We have theoretically and experimentally observed the asymmetric Fano resonances caused by the interference between the resonant and propagating self-collimated acoustic waves. It is demonstrated that the resonance dip frequency and Fano profile can be modulated by adjusting the structure parameters of the SC-based resonator. Our finding provides an efficient approach to manipulate sound propagation for future acoustic devices.

摘要

控制 Fano 共振的线型具有很大的潜在应用价值。在这里，我们提出了一种声 Fano 谐振器，它由二维声子晶体（SC）中的双层锯齿钢棒夹在多层锯齿线缺陷（ZLD）之间组成。我们已经从理论和实验上观察到了由共振和传播自准直声波干涉引起的不对称 Fano 共振。结果表明，通过调整基于 SC 的谐振器的结构参数，可以调制共振陷波的频率和 Fano 轮廓。我们的发现为未来的声学器件提供了一种有效控制声波传播的方法。