Comment on "Scattering Theory Derivation of a 3D Acoustic Cloaking Shell"

Details Comment on "Scattering Theory Derivation of a 3D Acoustic Cloaking Shell" Comment on "Scattering Theory Derivation of a 3D Acoustic Cloaking Shell"

2008-01-21

arxiv.org/abs/0801.3279v1

Physics

Optics

3 pages, RevTex

Scientific paper

In a recent Letter, Cummer et al. give a description of material parameters for acoustic wave propagation giving rise to a 3D spherical cloak, and verify the cloaking phenomenon on the level of scattering coefficients. A similar configuration has been given by Chen and Chan. In this Comment, we show that these theoretical constructions follow directly from our earlier work http://arxiv.org/abs/math/0611185 on full wave analysis of cloaking for the Helmholtz equation with respect to Riemannian metrics. Furthermore, the analysis there covers the case of acoustically radiating objects being enclosed in the cloaked region.

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