Active exterior cloaking for the 2D Helmholtz equation with complex wavenumbers and application to thermal cloaking - Inria - Institut national de recherche en sciences et technologies du numérique Accéder directement au contenu
Article Dans Une Revue Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences Année : 2022

Active exterior cloaking for the 2D Helmholtz equation with complex wavenumbers and application to thermal cloaking

Maxence Cassier
Sebastien Guenneau

Résumé

We design sources for the two-dimensional Helmholtz equation that can cloak an object by cancelling out the incident field in a region, without the sources completely surrounding the object to hide. As in previous work for real positive wavenumbers, the sources are also determined by the Green identities. The novelty is that we prove that the same approach works for complex wavenumbers which makes it applicable to a variety of media, including media with dispersion, loss and gain. Furthermore, by deriving bounds on Graf's addition formulas with complex arguments, we obtain new estimates that allow to quantify the quality of the cloaking effect. We illustrate our results by applying them to achieve active exterior cloaking for the heat equation.
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Dates et versions

hal-03843015 , version 1 (07-11-2022)

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Maxence Cassier, Trent DeGiovanni, Sebastien Guenneau, Fernando Guevara Vasquez. Active exterior cloaking for the 2D Helmholtz equation with complex wavenumbers and application to thermal cloaking. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2022, ⟨10.1098/rsta.2022.0073⟩. ⟨hal-03843015⟩
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