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Off-shell mean-field electromagnetic T-matrix of finite-size spheres and fuzzy scatterers

Abstract : We introduce a method for computing simple energy-conserving model T-matrices intended for use in multiple-scattering formalisms. Our method is to make separable approximations to the physical scattering potentials. Such a ‘mean-field' approximation permits a ready analytic evaluation of the T-matrix for a variety of scatterers, even ‘fuzzy' scatterers (e.g. fractal aggregates). In the small-size limit, our method reduces to the point-like resonant T-matrix introduced by Nieuwenhuizen et al. in 1992 thereby demonstrating the intrinsic mean-field nature of their approximation. We discuss causality in both models and show that the separable potential model possesses a wider range of applicability than the point-like model does.
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https://hal-cea.archives-ouvertes.fr/cea-00412636
Contributor : Yves-Patrick Pellegrini <>
Submitted on : Wednesday, September 2, 2009 - 12:45:53 PM
Last modification on : Thursday, January 23, 2020 - 6:22:07 PM

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Yves-Patrick Pellegrini, Brian Stout, Pascal Thibaudeau. Off-shell mean-field electromagnetic T-matrix of finite-size spheres and fuzzy scatterers. Journal of Physics: Condensed Matter, IOP Publishing, 1997, 9 (1), pp.177-191. ⟨10.1088/0953-8984/9/1/019⟩. ⟨cea-00412636⟩

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