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We extend and optimize the axisymmetric 2.5-D eigensolver to calculate the far-field results of axisymmetric structures in stratified backgrounds (SBs), which is useful and practical for optical design and engineering. Two kinds of near-field-to-far-field transformations (NFFFTs) are proposed. One is called closed-surface transformation which is based on the dipole radiations in SBs. The other is...
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