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View full-text article in PMC

. 2020 Jun 29;117(28):16138–16142. doi: 10.1073/pnas.1920549117

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Fig. 1. — Phononic crystal band structure. (A) Schematic of the phononic crystal formed by hexagonal unit cells with PLA ( $h_{0} = 0.5$ mm thick) as the host layer and attached circular PZT patches with thickness of $h_{1} = 0.5$ mm ( $d_{1} = 7$ mm in diameter) connected to external circuits. These circuits provide negative capacitance of $C' = - (R_{2} C_{0}) / R 1$ . (B) Comparison between the band structures in the absence (red dashed curves with two Dirac points at 45 and 73 kHz) and in the presence (blue solid curves with optimal bandgap at $C' = - 1.7$ nF) of completed external circuits attached to one PZT disk.