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12 September 2014Modal 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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C. Sauvan, J.-P. Hugonin, P. Lalanne, "Modal representation of light-matter interactions in plasmonic nanoresonators," Proc. SPIE 9162, Active Photonic Materials VI, 916203 (12 September 2014); https://doi.org/10.1117/12.2061824