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. 2016 May 20;7:11731. doi: 10.1038/ncomms11731

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(a) Analytically, numerically calculated and experimentally measured transmission spectra for helical-structured metamaterial unit cell with L=12.15 mm, P=7 mm. (b) Analytically, numerically calculated and experimentally measured transmission spectra for helical-structured metamaterial unit cell with L=13.49 mm, P=7.8 mm. Both transmission peaks are located at around 4170 Hz. However, the transmitted components from the two samples possess different phase delays due to the different helical characteristics. (c) Time domain waveforms experimentally measured by the microphone. Transmitted signal passing through sample 1 in a is shown with blue solid curves, while the transmitted waveform through air is shown in red dashed curves. (d) Experimentally measured transmitted signal when replacing sample 1 with sample 2 in b.