Journal
WAVE MOTION
Volume 48, Issue 6, Pages 515-524Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.wavemoti.2011.03.005
Keywords
Active cloaking; Acoustic waves; Helmholtz equation; Green's formula
Categories
Funding
- National Science Foundation [DMS-070978]
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We cloak a region from a known incident wave by surrounding the region with three or more devices that cancel out the field in the cloaked region without significantly radiating waves. Since very little waves reach scatterers within the cloaked region, the scattered field is small and the scatterers are for all practical purposes undetectable. The devices are multipolar point sources that can be determined from Green's formula and an addition theorem for Hankel functions. The cloaking devices are exterior to the cloaked region. (C) 2011 Elsevier B.V. All rights reserved.
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