journal article·2022-06-01Open access

Step-wise constant-amplitude waves in non-Hermitian disordered media

Haixiao Zhang, Yiwei Zhang, Xiaoli Liu, Yu Bao, Jinyu Zhao

AIP Advances· Volume 12· Issue 6

Abstract

Multi-reflection interference of sound waves is ubiquitous in our daily life, and suppressing any such distortions of a wave’s free propagation and achieving counter-directional adaptation is a challenging task, with many applications in acoustics. Here, we propose a non-Hermitian Fabry–Perot resonance unit, which demonstrates unidirectional invisibility in opposite directions at the so-called exceptional points by adjusting its geometric configuration and intrinsic acoustic parameters. Then, we extend the principle and design a waveguide containing six inclusion–membrane pairs in which a unique property of step-wise constant-amplitude waves in two opposite directions has been realized, irrespective of whether the distribution of inclusions is periodic or random. Our method breaks through the limitation of the impedance, amount, position of the inclusions, and the incident direction of the waves, revealing potential applications in acoustic sensing, noise control engineering, and other related wave disciplines.
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Research context

OpenAlex topics: Quantum Mechanics and Non-Hermitian Physics · Nonlinear Photonic Systems · Acoustic Wave Phenomena Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Electrical and Information Engineering, Changzhou Institute of Technology 1 , Changzhou 213032, China

MOE Key Laboratory of Modern Acoustics, Nanjing University 2 , Nanjing 210093, China

School of Aviation and Mechanical Engineering, Changzhou Institute of Technology 3 , Changzhou 213032, China

Key Laboratory of Architectural Acoustic Environment of Anhui Higher Education Institutes, Anhui Jianzhu University 4 , Hefei 230601, China

Funding

National Natural Science Foundation of China · Natural Science Research of Jiangsu Higher Education Institutions of China · Natural Science Foundation of Changzhou City · Natural Science Foundation of Anhui Province · University Natural Science Research Project of Anhui Province · Jiangsu Province’s Key Provincial Talents Program

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