Presentation + Paper
18 April 2021 Sound directivity by ΡΤ-symmetric acoustic dipoles
Tetsu Magariyachi, Helena Arias Casals, Ramon Herrero, Muriel Botey, Kestutis Staliunas
Author Affiliations +
Abstract
The new physics of open-dissipative, non-Hermitian systems have become a fruitful playground to uncover novel physical phenomena, even in exotic or counterintuitive ways, especially in optics and, more recently, also in acoustics. In this work, we propose a non-Hermitian metasystem in acoustics for the control of the sound field in two dimensions. The building blocks, or meta-atoms composing the arrangements, are pairs of identical Helmholtz resonators with different gain or loss functions. Such Helmholtz resonator dipoles may be designed to hold asymmetric scattering, as was theoretically analyzed and experimentally confirmed. Furthermore, aiming to create a complicated directivity, we explored different ensembles of Helmholtz resonator dipoles and numerically demonstrated a sound concentration with various configurations. The proposed non-Hermitian parity-time- symmetric dipoles made of a pair of Helmholtz resonators may be a potential artificial element for the creation of complex sound fields.
Conference Presentation
© (2021) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Tetsu Magariyachi, Helena Arias Casals, Ramon Herrero, Muriel Botey, and Kestutis Staliunas "Sound directivity by ΡΤ-symmetric acoustic dipoles", Proc. SPIE 11769, Metamaterials XIII, 117690P (18 April 2021); https://doi.org/10.1117/12.2593240
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KEYWORDS
Acoustics

Metamaterials

Absorption

Scattering

Diffusion

Microwave radiation

Resonators

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