Modal representation of light-matter interactions in plasmonic nanoresonators

We have developed a self-consistent electromagnetic theory of the link between light-matter interactions and optical resonances in three-dimensional nanoresonators. The theory that relies on the concept of quasinormal modes with complex frequencies is capable of accurately handling any photonic or plasmonic resonator with strong radiation leakage, absorption and material dispersion. We first provide a simple iterative method to calculate and normalize quasinormal modes that may be implemented with any numerical tool. We then use the modal formalism to derive a modal expansion of the imaginary part of the Green tensor. This modal representation provides a powerful tool to calculate and understand light-matter interactions in complex photonic or plasmonic systems. In particular, we analyze the degree of spatial coherence in nanoantennas made of metallic nanorods.

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