We show strong coupling involving three different types of resonances in plasmonic nanoarrays: surface lattice resonances, localized surface plasmon resonances on single nanoparticles, and excitations of organic dye molecules. We study spatial coherence properties of a plasmonic nanoarray covered with a dye molecule film by a double slit experiment. A continuous evolution of coherence from the weak to the strong coupling regime is observed. Finally, we show with magnetic nanoparticles how the intrinsic spin-orbit coupling of the material interplays with the symmetries of the nanoparticle array, and mention our latest results on light-matter interactions in plasmonic lattices.
Tommi K. Hakala, Jani-Petri Martikainen, Heikki T. Rekola, Aaro I. Väkeväinen, and Päivi Törmä, "Strong light-matter interactions in plasmonic lattices," Proc. SPIE 9918, Metamaterials, Metadevices, and Metasystems 2016, 991806 (Presented at SPIE Nanoscience + Engineering: August 28, 2016; Published: 16 September 2016); https://doi.org/10.1117/12.2237955.
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