Measuring monopole and dipole polarizability of acoustic meta-atoms

Publication Type:
Journal Article
Citation:
Applied Physics Letters, 2018, 113 (22)
Issue Date:
2018-11-26
Filename Description Size
APL_Jordaan_et_al_2018.pdfPublished Version1.08 MB
Adobe PDF
Full metadata record
© 2018 Author(s). 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.
Please use this identifier to cite or link to this item: