Journal
SCIENCE BULLETIN
Volume 64, Issue 12, Pages 808-813Publisher
ELSEVIER
DOI: 10.1016/j.scib.2019.01.002
Keywords
Asymmetric transmission; Surface waves; Gradient index metamaterials; Waveguide
Categories
Funding
- National Key Research and Development Program of China [2017YFA0700201, 2017YFA0700202, 2017YFA0700203]
- National Natural Science Foundation of China [61631007, 61571117, 61138001, 61371035, 61722106, 61731010, 11227904]
- 111 Project [111-2-05]
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We demonstrate that asymmetric acoustic wave transmission in a waveguide can be achieved via gradient index metamaterials (GIMs). We theoretically prove that the acoustic wave can be efficiently converted to surface waves (SWs) via GIMs. The GIMs in a waveguide can allow the transmission of acoustic waves in one direction but block them in the other direction. This theory is validated by experiments. Our findings may provide new applications in various scenarios such as high-efficiency acoustic couplers and noise control. (C) 2019 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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