Interface States in the Acoustic Quasiperiodic System Based on Non-Bragg Resonances,Physica Status Solidi (B) - Basic Solid State Physics

当前位置： X-MOL 学术 › Phys. Status Solidi B › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Interface States in the Acoustic Quasiperiodic System Based on Non-Bragg Resonances
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2021-08-21 , DOI: 10.1002/pssb.202100273
Ting Liu _{1,

2} , Shi-Jian Peng ₁ , Jia-Yi Zhang ₁ , Ya-Xian Fan _{1,

3} , Zhi-Yong Tao _{1,

3}

Affiliation

Bragg resonances have been observed in traditional quasiperiodic waveguides for years. To enhance Bragg resonances and form Bragg gaps with high attenuation, a large number of units have been included. Here, a Fibonacci quasiperiodic acoustic waveguide based on an intense resonance mechanism is proposed to realize non-Bragg resonances. In a waveguide with fewer units, non-Bragg resonances can still be excited and create the related non-Bragg gaps with high attenuation beyond the Bragg ones. Furthermore, an interface state arising in non-Bragg gaps is experimentally observed by fabricating the mirror-symmetry structure of Fibonacci quasi-periodic waveguides. The field distribution of interface states exhibits a significant feature of sound energy, which is localized at a quarter wavelength from the interface of the mirror structures on both sides. Unlike the interface state in Bragg gaps (the localized sound energy distributes along the longitudinal direction), the interface state in non-Bragg gaps displays localization along the longitudinal and radial directions, and the field distribution is like a dipole, which can be used to optimize traditional quasiperiodic waveguide structures and pave the way for various functional devices, which include multimode filters, sensors, couplers, and so on.

中文翻译：

基于非布拉格共振的声准周期系统中的界面态

多年来，人们一直在传统的准周期波导中观察到布拉格共振。为了增强布拉格共振并形成具有高衰减的布拉格间隙，已经包括了大量的单元。在这里，提出了一种基于强共振机制的斐波那契准周期声波导管来实现非布拉格共振。在具有较少单元的波导中，仍然可以激发非布拉格共振并产生相关的非布拉格间隙，其衰减比布拉格间隙高。此外，通过制造斐波那契准周期波导的镜像对称结构，通过实验观察到非布拉格间隙中出现的界面态。界面态的场分布表现出声能的显着特征，声能位于两侧反射镜结构界面的四分之一波长处。

更新日期：2021-08-21

点击分享查看原文

点击收藏

阅读更多本刊最新论文