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We show that the far fields generated by a source inside or near a microparticle can be obtained readily by using the reciprocity theorem along with the internal or near fields generated by plane-wave illumination. This method is useful for solving problems for which the scattered fields generated with plane-wave illumination have already been obtained. We illustrate the method for the case of a homogeneous sphere and then apply it to the problem of emission from a dipole inside a sphere that is near a plane interface.
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Hill et al. (1997) studied this question.
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