Symmetrical and anti-symmetrical coherent perfect absorption for acoustic waves

Pengjiang Wei; Charles Croënne; Sai Tak Chu; Jensen Li

doi:10.1063/1.4869462

Symmetrical and anti-symmetrical coherent perfect absorption for acoustic waves

Pengjiang Wei, Charles Croënne, Sai Tak Chu, Jensen Li

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

138 Citations (Scopus)

134 Downloads (CityUHK Scholars)

Abstract

We investigate tunable acoustic absorption enabled by the coherent control of input waves. It relies on coherent perfect absorption originally proposed in optics. By designing appropriate acoustic metamaterial structures with resonating effective bulk modulus or density, we show that complete absorption of incident waves impinging on the metamaterial can be achieved for either symmetrical or anti-symmetrical inputs in the forward and backward directions. By adjusting the relative phase between the two incident beams, absorption can be tuned effectively from unity to zero, making coherent control useful in applications like acoustic modulators, noise controllers, transducers, and switches. © 2014 AIP Publishing LLC.

Original language	English
Article number	121902
Journal	Applied Physics Letters
Volume	104
Issue number	12
Online published	24 Mar 2014
DOIs	https://doi.org/10.1063/1.4869462
Publication status	Published - 24 Mar 2014

Publisher's Copyright Statement

COPYRIGHT TERMS OF DEPOSITED FINAL PUBLISHED VERSION FILE: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Pengjiang Wei, Charles Croënne, Sai Tak Chu, and Jensen Li , "Symmetrical and anti-symmetrical coherent perfect absorption for acoustic waves", Appl. Phys. Lett. 104, 121902 (2014) and may be found at https://doi.org/10.1063/1.4869462.

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AB - We investigate tunable acoustic absorption enabled by the coherent control of input waves. It relies on coherent perfect absorption originally proposed in optics. By designing appropriate acoustic metamaterial structures with resonating effective bulk modulus or density, we show that complete absorption of incident waves impinging on the metamaterial can be achieved for either symmetrical or anti-symmetrical inputs in the forward and backward directions. By adjusting the relative phase between the two incident beams, absorption can be tuned effectively from unity to zero, making coherent control useful in applications like acoustic modulators, noise controllers, transducers, and switches. © 2014 AIP Publishing LLC.

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JO - Applied Physics Letters

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Symmetrical and anti-symmetrical coherent perfect absorption for acoustic waves

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