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(a) Schematic illustration of the unit cell's component and geometry of the hybrid resonator. (b) Schematic cross-sectional illustration of the two lowest frequency eigen-modes of the DMR, plotted in reference to the same phase of incident wave, with W being the normal displacement of membrane, normalized to its surface average component 〈W〉. (c) Displacement profile of the DMR’s hybrid mode at 152 Hz, which is clearly a superposition of the two in (b), but with an almost an order of magnitude larger amplitude. However, such large amplitude oscillations are only coupled to the non-radiative evanescent waves. Experimentally measured results (symmetrically plotted from data along the radial direction on one side) are shown in red circles while the simulated results are in black curves. Excellent agreement is seen.
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