Abstract：
:Systems of closely-spaced resonators can be strongly coupled by interactions mediated by scattered electromagnetic fields. In large systems the resulting response has been shown to be more sensitive to these collective interactions than to the detailed structure of individual resonators. Attempts to describe such systems have resulted in point-dipole approximations to resonators that are computationally efficient for large resonator ensembles. Here we provide a detailed study for the validity of point dipole approximations in small systems of strongly coupled plasmonic nanorods, including the cases of both super-radiant and subradiant excitations, where the characteristics of the excitation depends on the spatial separation between the nanorods. We show that over an appreciable range of rod lengths centered on 210 nm, when the relative separation kl in terms of the resonance wave number of light k satisfies [Formula: see text], the point electric dipole model becomes accurate. However, when the resonators are closer, the finite-size and geometry of the resonators modifies the excitation modes, in particular the cooperative mode line shifts of the point dipole approximation begin to rapidly diverge at small separations. We also construct simplified effective models by describing a pair of nanorods as a single effective metamolecule.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Watson DW,Jenkins SD,Fedotov VA,Ruostekoski Jdoi
10.1038/s41598-019-41327-6subject
Has Abstractpub_date
2019-04-05 00:00:00pages
5707issue
1issn
2045-2322pii
10.1038/s41598-019-41327-6journal_volume
9pub_type
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