A numerical study of acoustic scattering by Janus spheres

Stuart C. Hawkins*, Tom Rother, Jochen Wauer

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Recently Janus particles have become important in several technological fields because they have interesting properties compared with homogeneous particles. The interaction of Janus particles with sound waves is of particular interest for diagnostic purposes, and also in applications in micro-and nanotechnology. In this paper the authors demonstrate that a method of fundamental solution combined with a T-matrix that is computed from far-field information can be applied with benefit to analyse the scattering of sound waves by a particular type of Janus sphere. Moreover, it is shown that this method converges faster than the conventional T-matrix method introduced by Waterman [(1969). J. Acoust. Soc. Am. 45, 1417-1429]. This is of special importance if orientation averaged scattering quantities are required, or if multiple scattering processes on Janus spheres are considered. This method is used to demonstrate the interesting phenomenon of an enhanced side scattering intensity that is larger than the forward scattering intensity, and that this effect can be strengthened using a particular configuration of two identical Janus spheres. Finally, the authors discuss a useful approximation that can be readily applied for two or more Janus spheres.

Original languageEnglish
Pages (from-to)4097-4105
Number of pages9
JournalJournal of the Acoustical Society of America
Volume147
Issue number6
Early online date23 Jun 2020
DOIs
Publication statusPublished - Jun 2020

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