TY - JOUR A1 - Jordaan, Joshua A1 - Punzet, Stefan A1 - Melnikov, Anton A1 - Sanches, Alexandre A1 - Oberst, Sebastian A1 - Marburg, Steffen A1 - Powell, David A. T1 - Measuring monopole and dipole polarizability of acoustic meta-atoms JF - Applied physics letters N2 - We present a method to extract monopole and dipole polarizability from experimental measurements of two-dimensional acoustic meta-atoms. In contrast to extraction from numerical results, this enables all second-order effects and uncertainties in material properties to be accounted for. We apply the technique to 3D-printed labyrinthine meta-atoms of a variety of geometries. We show that the polarizability of structures with a shorter acoustic path length agrees well with numerical results. However, those with longer path lengths suffer strong additional damping, which we attribute to the strong viscous and thermal losses in narrow channels. KW - METASURFACE KW - SOUND Y1 - 2018 U6 - https://doi.org/10.1063/1.5052661 VL - 113 IS - 22 PB - AIP Publishing ER -