Fig. 4: Topological acoustic beam splitter.
From: Higher-order topological transport protected by boundary Chern number in phononic crystals
a Configuration of the \(25\)-layer sample. b An image of the \(25\)-layer experimental sample. c Simulated topological splitting effect of sound at \(f=4.16\,{{{{{\rm{kHz}}}}}}\). d The same as c, but for measured results. Again, the measured data of each layer are normalized by the corresponding maximum value. The 2D presentations of the data can be found in Supplementary Fig. 9. In b–d the cyan dot and green dots/circle label the point sources, and the black arrows represent the propagations of sound.
