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. 2015 Mar 20;5:9376. doi: 10.1038/srep09376

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(a) One unit-cell of cellular metamaterial plates with a pair of stubs, where the lattice constant a = 5L = 10 mm. The unit-cells are periodically arrayed in x-direction, whose band structure is calculated in (b). For the lowest locally resonant eigenmodes marked by an arrow in (b), the displacement eigenfield distributions with scaled deformations are shown in (c): anti-symmetry mode (A₀) and (d): symmetry mode (S₀), respectively. (e) The resonance frequencies of A₀ mode and S₀ mode versus the relative density of SD caps in the composite stubs. Here and hereafter, the frequency is normalized by 2πc_t/a.