Abstract
The optical theorem is generalized to the case of excitation of a local inhomogeneity introduced in a transparent substrate by a multipole of arbitrary order. It is shown that, to calculate the generalized extinction cross section, it is sufficient to calculate the derivatives of the scattered field at a single point by adding a constant and a definite integral. Apart from general scientific interest, the proposed generalization makes it possible to calculate the absorption cross section by subtracting the scattering cross section from the extinction cross section. The latter fact is important, because the scattered field in the far zone contains no Sommerfeld integrals. In addition, the proposed generalization allows one to test computer modules for the case where a lossless inhomogeneity is considered.
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Original Russian Text © Yu.A. Eremin, A.G. Sveshnikov, 2017, published in Akusticheskii Zhurnal, 2017, Vol. 63, No. 4, pp. 349–355.
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Eremin, Y.A., Sveshnikov, A.G. Generalization of the optical theorem for an arbitrary multipole in the presence of a transparent half-space. Acoust. Phys. 63, 378–384 (2017). https://doi.org/10.1134/S1063771017040030
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DOI: https://doi.org/10.1134/S1063771017040030