Cloaking and anamorphism for light and mass diffusion

Abstract : We first review classical results on cloaking and mirage effects for electromagnetic waves. We then show that transformation optics allows the masking of objects or produces mirages in diffusive regimes. In order to achieve this, we consider the equation for diffusive photon density in transformed coordinates, which is valid for diffusive light in scattering media. More precisely, generalizing transformations for star domains introduced in (Diatta and Guenneau J. Opt. 13 024012) for matter waves, we numerically demonstrate that infinite conducting objects of different shapes scatter diffusive light in exactly the same way. We also propose a design of an external light-diffusion cloak with spatially varying sign-shifting parameters that hides a finite size scatterer outside the cloak. We next analyze non-physical parameters in the transformed Fick's equation derived in (Guenneau and Puvirajesinghe R. Soc. Interface 10 20130106), and propose the use of a non-linear transform that overcomes this problem. We finally investigate other forms of invariant transformed diffusion-like equations in the time domain, and touch upon conformal mappings and non-Euclidean cloaking applied to diffusion processes.
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https://hal.archives-ouvertes.fr/hal-01645093
Contributor : Sébastien Guenneau <>
Submitted on : Wednesday, November 22, 2017 - 7:23:54 PM
Last modification on : Friday, April 12, 2019 - 2:54:02 PM

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Sébastien Guenneau, Andre Diatta, Tania M Puvirajesinghe, Mohamed Farhat. Cloaking and anamorphism for light and mass diffusion. Journal of Optics A: Pure and Applied Optics, IOP Publishing, 2017, 19 (10), pp.10300. ⟨hal-01645093⟩

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