Fig. 3: Experimental observation in the nontrivial lattice.
From: Non-Hermitian route to higher-order topology in an acoustic crystal
a Photo of a 3D printed lattice with 12 × 12 resonators. b Measured acoustic intensity spectra for the sample in (a). Red, yellow, and blue curves represent the corner, edge, bulk spectra measured at the resonators labeled as “1”, “2”, and “3” in (a), respectively. c–e Measured intensity profiles at the peaks of the corner, edge, bulk spectra, denoted by the red (2142 Hz), yellow (2164 Hz), and blue (2170 Hz) dashed lines in (b), respectively. In c–e, both the height and color of each bar indicate the power strength.
