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Crystals 2017, 7(11), 323;

Longitudinal Near-Field Coupling between Acoustic Resonators Grafted onto a Waveguide

Institute of Engineering Mechanics, Beijing Jiaotong University, Beijing 100044, China
Franche-Comté Electronique Mécanique Thermique et Optique, CNRS UMR 6174, Université de Bourgogne Franche-Comté, F-25030 Besançon, France
Author to whom correspondence should be addressed.
Academic Editor: Sarah Benchabane
Received: 3 October 2017 / Revised: 20 October 2017 / Accepted: 23 October 2017 / Published: 26 October 2017
(This article belongs to the Special Issue Phononics)
PDF [1827 KB, uploaded 27 October 2017]


We investigate longitudinal near-field coupling between acoustic resonators grafted along a waveguide. Experiments are performed in the audible range with a simple acoustic system composed of a finite aperiodic sequence of air resonators. Transmission typically shows a zero around a resonance frequency of a single resonator, as is well known. When two identical resonators are brought in close proximity, however, we observe that longitudinal near-field coupling strongly influences the acoustic transmission. When the separation between resonators is increased so that they can be considered in the far field of one another, we further observe the appearance of Fano-like transmission profiles. We explain this observation by the formation of locally resonant Fabry-Perot interferometers from every pair of resonators. All experimental results are compared to three-dimensional finite element analysis of the acoustic system. View Full-Text
Keywords: near-field coupling; acoustic resonator; Fabry-Perot interferometer near-field coupling; acoustic resonator; Fabry-Perot interferometer

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Wang, Y.-F.; Laude, V. Longitudinal Near-Field Coupling between Acoustic Resonators Grafted onto a Waveguide. Crystals 2017, 7, 323.

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