Measuring monopole and dipole polarizability of acoustic meta-atoms

被引：14

作者：

Jordaan, Joshua ^{[1
]}

Punzet, Stefan ^{[1
,2
,3
]}

Melnikov, Anton ^{[4
,5
,6
]}

Sanches, Alexandre ^{[1
,7
]}

Oberst, Sebastian ^{[5
]}

Marburg, Steffen ^{[4
]}

Powell, David A. ^{[1
,6
]}

机构：

[1] Australian Natl Univ, Res Sch Phys & Engn, Nonlinear Phys Ctr, Canberra, ACT 2601, Australia

[2] Ostbayer TH Regensburg, Fac Elect Engn & Informat Technol, D-93053 Regensburg, Germany

[3] Tech Univ Munich, Dept Elect & Comp Engn, Theresienstr 90, D-80333 Munich, Germany

[4] Tech Univ Munich, Vibroacoust Vehicles & Machines, Boltzmann Str 15, D-85748 Garching, Germany

[5] Univ Technol Sydney, Ctr Audio Acoust & Vibrat, Sydney, NSW 2007, Australia

[6] Univ New South Wales, Sch Engn & Informat Technol, Canberra, ACT 2610, Australia

[7] Univ Sao Paulo, Sch Engn, Ave Prof Luciano Gualberto 380, BR-05508010 Sao Paulo, SP, Brazil

来源：

APPLIED PHYSICS LETTERS | 2018年 / 113卷 / 22期

基金：

澳大利亚研究理事会;

关键词：

SOUND; METASURFACE;

D O I：

10.1063/1.5052661

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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. Published by AIP Publishing.

引用

页数：5

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