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Paper detail

Quasinormal mode expansion of optical far-field quantities

Quasinormal mode (QNM) expansion is a popular tool to analyze light-matter interaction in nanoresonators. However, expanding far-field quantities such as the energy flux is an open problem because QNMs diverge with an increasing distance to the resonant systems. We introduce a theory to compute modal expansions of far-field quantities rigorously. The presented approach is based on the complex eigenfrequencies of QNMs. The divergence problem is circumvented by using contour integration with an analytical continuation of the far-field quantity into the complex frequency plane. We demonstrate the approach by computing the angular resolved modal energy flux in the far field of a nanophotonic device.

preprint2020arXivOpen access
Felix BinkowskiFridtjof BetzRémi ColomMartin HammerschmidtLin ZschiedrichSven Burger
physics.comp-phphysics.optics
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Felix BinkowskiFridtjof BetzRémi ColomMartin HammerschmidtLin ZschiedrichSven Burger

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