Scattering theory derivation of a 3D acoustic cloaking shell

TitleScattering theory derivation of a 3D acoustic cloaking shell
Publication TypeJournal Article
Year of Publication2008
AuthorsS..A. Cummer, B-I. Popa, D.. Schurig, D.R. Smith, J..B. Pendry, M.. Rahm, A..F. Starr
JournalPhysical Review Letters
Volume100
Issue2
ISBN Number0031-9007
Accession NumberWOS:000252471200036
Abstract

Through acoustic scattering theory we derive the mass density and bulk modulus of a spherical shell that can eliminate scattering from an arbitrary object in the interior of the shell-in other words, a 3D acoustic cloaking shell. Calculations confirm that the pressure and velocity fields are smoothly bent and excluded from the central region as for previously reported electromagnetic cloaking shells. The shell requires an anisotropic mass density with principal axes in the spherical coordinate directions and a radially dependent bulk modulus. The existence of this 3D cloaking shell indicates that such reflectionless solutions may also exist for other wave systems that are not isomorphic with electromagnetics.