Direct and inverse scattering problems for spherical Electromagnetic waves in chiral media

Details Direct and inverse scattering problems for spherical Electromagnetic waves in chiral media Direct and inverse scattering problems for spherical Electromagnetic waves in chiral media

2008-12-11

arxiv.org/abs/0812.2169v1

Physics

Classical Physics

14 pages

Scientific paper

We study the direct and inverse scattering problems when the incident electromagnetic field is a time harmonic point- generated wave in a chiral medium and the scatterer is a perfectly conducting sphere. The exact Green s function and the electric far-field patterns of the scattering problem are constructed. For a small sphere, a closed-form approximation of the scattered wave field at the source of the incident spherical wave is obtained. These near-field results lead to the solution of an inverse problem. We also treat the same inverse problem using far-field results via the leading order term in the low-frequency asymptotic expansion of the scattering cross-section.

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