Dopant-modulated sound transmission with zero index acoustic metamaterials

Zhongming Gu, He Gao, Tuo Liu, Yong Li, Jie Zhu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Zero index metamaterials have shown the ability to achieve total transmission or reflection by embedding particular defects with various effective parameters. Here, we present that tunable sound transmission can be realized by configuring a subwavelength-sized dopant inside zero index acoustic metamaterials. Despite its small spatial signature, the dopant is able to strongly interact with the acoustic waves inside the whole zero index metamaterials. It is due to the essence of the zero effective index that can homogenize the pressure field within the metamaterials. Sound transmission can thus be fully switched on and off by adjusting the dopant's surface impedance. A simple rectangular cavity with varied lengths is proposed to provide the required impedance boundary. Our model of correlating the dopant design with sound transmission performance is validated theoretically and numerically. We further demonstrate the utilization of the proposed design to effectively modulate the sound focusing effect. Such a dopant-modulated sound transmission scheme, with its simplicity and capability, has potential applications in fields like noise control and ultrasonography.

Original languageEnglish
Pages (from-to)1636-1641
Number of pages6
JournalJournal of the Acoustical Society of America
Volume148
Issue number3
DOIs
Publication statusPublished - 1 Sep 2020

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

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