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http://hdl.handle.net/10397/88416
Title: | Dopant-modulated sound transmission with zero index acoustic metamaterials | Authors: | Gu, Z Gao, H Liu, T Li, Y Zhu, J |
Issue Date: | Sep-2020 | Source: | Journal of the Acoustical Society of America, Sept 2020, v. 148, no. 3, p. 1636-1641 | 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. | Publisher: | Acoustical Society of America | Journal: | Journal of the Acoustical Society of America | ISSN: | 0001-4966 | EISSN: | 1520-8524 | DOI: | 10.1121/10.0001962 | Rights: | Copyright 2020 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America. The following publication Z. Gu, H. Gao, T. Liu, Y. Li, and J. Zhu, J. Acoust. Soc. Am. 148 1636 (2020) is available at https://dx.doi.org/10.1121/10.0001962 |
Appears in Collections: | Journal/Magazine Article |
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Gu_Dopant-modulated_Sound_Transmission.pdf | 3.69 MB | Adobe PDF | View/Open |
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