@article{JordaanPunzetMelnikovetal., author = {Jordaan, Joshua and Punzet, Stefan and Melnikov, Anton and Sanches, Alexandre and Oberst, Sebastian and Marburg, Steffen and Powell, David A.}, title = {Measuring monopole and dipole polarizability of acoustic meta-atoms}, series = {Applied physics letters}, volume = {113}, journal = {Applied physics letters}, number = {22}, publisher = {AIP Publishing}, doi = {10.1063/1.5052661}, abstract = {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.}, language = {en} }