Abstract
The optical theorem is generalized to the case of local body excitation by multipole sources. It is found that, to calculate the extinction cross section, it is sufficient to calculate the scattered field derivatives at a single point. It is shown that the Purcell factor, which is a rather important parameter, can be represented in analytic form. The result is generalized to the case of a local scatterer incorporated in a homogeneous halfspace.
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Original Russian Text © Yu.A. Eremin, A.G. Sveshnikov, 2016, published in Akusticheskii Zhurnal, 2016, Vol. 62, No. 3, pp. 271–276.
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Eremin, Y.A., Sveshnikov, A.G. Optical theorem for multipole sources in wave diffraction theory. Acoust. Phys. 62, 263–268 (2016). https://doi.org/10.1134/S1063771016030064
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DOI: https://doi.org/10.1134/S1063771016030064