Symmetrical and anti-symmetrical coherent perfect absorption for acoustic waves

Journal Article · Mon Mar 24 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4869462· OSTI ID:22258619

Wei, Pengjiang; Croënne, Charles; Tak Chu, Sai ^[1]; Li, Jensen ^[2]

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1. Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon (Hong Kong)
2. School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT (United Kingdom)

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.

• OSTI ID: 22258619
• Journal Information: Applied Physics Letters, Vol. 104, Issue 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
NOISE
SOUND WAVES
TRANSDUCERS