Abstract
A strong coupling meta-diatom-plasmonic nanocavity is proposed and numerically investigated. When the meta-diatomic sizes are gradually increased, the meta-diatomic electric dipole and quadrupole resonances could strongly couple to those of the nanocavity. The characteristic anticrossing behaviors of three hybrid modes manifest the occurrence of the strong coupling from the transmission spectra, with Rabi-type splittings at about 40.8 meV and 128.4 meV for dipole interaction, and 11.8 meV and 72.7 meV for quadrupole interaction, respectively. We also present the coupling strength dependence on meta-atomic positions, in which one meta-atomic position is fixed and the other is changed. The average Rabi-type splittings of three polariton modes are used to evaluate the coupling strength of the meta-atomic position dependence. The corresponding Rabi-type oscillation in the time domain is also presented, which is obviously different from the one of a single meta-atom strongly coupling to a nanocavity.
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