Fig. 4: Experimental results on the monopole cavity. | Nature Communications

Fig. 4: Experimental results on the monopole cavity.

From: Observation of monopole topological mode

Fig. 4

a Photograph of the experiment setup and a zoom-in of the sample surface. The 3D-printed cavity has a lattice constant a = 3 cm and a sample size of (12a)3. b The frequency response of the cavity shows a single mid-gap resonance. c–e Probe scans of the pressure field distributions inside the sample at three resonant peaks across the bandgap.

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