Abstract
We discuss an approach for modal expansion of optical far-field quantities based on quasinormal modes (QNMs). The issue of the exponential divergence of QNMs is circumvented by contour integration of the far-field quantities involving resonance poles with negative and positive imaginary parts. A numerical realization of the approach is demonstrated by convergence studies for a nanophotonic system.
Highlights
For the study of physical phenomena in nano-optical systems, a modal description is the most instructive approach
We discuss an approach for modal expansion of optical far-field quantities based on quasinormal modes (QNMs)
The issue of the exponential divergence of QNMs is circumvented by contour integration of the far-field quantities involving resonance poles with negative and positive imaginary parts
Summary
For the study of physical phenomena in nano-optical systems, a modal description is the most instructive approach. We discuss an approach for modal expansion of optical far-field quantities based on quasinormal modes (QNMs). The issue of the exponential divergence of QNMs is circumvented by contour integration of the far-field quantities involving resonance poles with negative and positive imaginary parts.
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