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Acoustic omni meta-atom for decoupled access to all octants of a wave parameter space

Koo, Sukmo and Cho, Choonlae and Jeong, Jun-ho and Park, Namkyoo (2016) Acoustic omni meta-atom for decoupled access to all octants of a wave parameter space. Nature Communications, 7 . Art. No. 13012. ISSN 2041-1723. PMCID PMC5056457. doi:10.1038/ncomms13012.

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The common behaviour of a wave is determined by wave parameters of its medium, which are generally associated with the characteristic oscillations of its corresponding elementary particles. In the context of metamaterials, the decoupled excitation of these fundamental oscillations would provide an ideal platform for top–down and reconfigurable access to the entire constitutive parameter space; however, this has remained as a conceivable problem that must be accomplished, after being pointed out by Pendry. Here by focusing on acoustic metamaterials, we achieve the decoupling of density ρ, modulus B^(−1) and bianisotropy ξ, by separating the paths of particle momentum to conform to the characteristic oscillations of each macroscopic wave parameter. Independent access to all octants of wave parameter space (ρ, B^(−1), ξ)=(+/−,+/−,+/−) is thus realized using a single platform that we call an omni meta-atom; as a building block that achieves top–down access to the target properties of metamaterials.

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Park, Namkyoo0000-0003-0197-7633
Additional Information:© 2016 The Author(s). This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit Received: 07 February 2016; Accepted: 25 August 2016; Published online: 30 September 2016. This study was supported by the National Research Foundation funded by the Ministry of Science, ICT and Future Planning (Global Frontier Program: No. NRF-2014M3A6B3063708 and Global Research Laboratory: No. NRF-2008-00580). Author Contributions: S.K. and N.P. devised the structure of the meta-atom and wrote the manuscript. S.K. performed the theoretical analysis of the meta-atom and designed the experiment. C.C. verified the analytical and numerical results, prepared the experimental set-up and performed measurements. J.J. fabricated the meta-atom structures. N.P. conceived the idea and checked the theoretical derivations. All authors contributed to the revisions of the manuscript. The authors declare no competing financial interests.
Funding AgencyGrant Number
National Research Foundation of Korea2014M3A6B3063708
National Research Foundation of KoreaNRF-2008-00580
Ministry of Science, ICT and Future Planning (Korea)UNSPECIFIED
PubMed Central ID:PMC5056457
Record Number:CaltechAUTHORS:20161114-123734083
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Official Citation:Koo, S. et al. Acoustic omni meta-atom for decoupled access to all octants of a wave parameter space. Nat. Commun. 7, 13012 doi: 10.1038/ncomms13012 (2016)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71996
Deposited By: Tony Diaz
Deposited On:15 Nov 2016 00:55
Last Modified:11 Nov 2021 04:54

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