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. 2016 Jul 22;6:30254. doi: 10.1038/srep30254

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Copyright © 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 http://creativecommons.org/licenses/by/4.0/

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Normalized acoustic signals measured in the third unit U₃ at (a) 470 Hzand (b) 620 Hz when the driving voltage switches between 0 V and 6 V. The envelops of the amplitudes are extracted with STFT, which are indicated by red dashed lines. The inset shows the definition of the response or recovery time of the tunable metamaterial.