Abstract
In this paper, we investigate the strong coupling effects between a meta-atom and a metal-insulator-metal (MIM) nanocavity. By changing the meta-atom sizes, we achieve the meta-atomic electric dipole, quadrupole or multipole interaction with the plasmonic nanocavity, in which characteristic anticrossing behaviors demonstrate the occurrence of the strong coupling. The various interactions present obviously different splitting values and behaviors of dependence on the meta-atomic position. The largest Rabi-type splittings, about 360.0 meV and 306.1 meV, have been obtained for electric dipole and quadrupole interaction, respectively. We attribute the large splitting to the highly-confined cavity mode and the large transition dipole of the meta-atom. Also the Rabi-type oscillation in time domain is given.
Highlights
In recent years, surface plasmons are intensively studied, mainly due to the subwavelength lightconfinement and the local field enhancement
Ultracompact aperture-coupled plasmonic ring resonators with submicron bending radii based on strongly-confined MIM plasmonic waveguides have been proposed and investigated
To solve the technical problems of MIM plasmonic Bragg reflectors (PBRs) with step profiles, sawtooth profiles are proposed and numerical study reveals that they have lower insertion loss, narrower bandgap, and reduced rippling in the transmission spectrum when compared with the step PBRs
Summary
Hosseini used characteristic impedance model to design MIM Bragg reflectors.[10] The bandgap width could be widened by inserting the high index material into narrower slits with wider ones unfilled.[11,12] By introducing an defect in the periodicity, plasmonic nanocavity can be formed and can be used in filters, low-threshold lasers and light-emitting diodes.[11,12] Based on the transfer-matrix method, finite planar MIM plasmonic waveguides have been systematically investigated, where bound and leaky surface plasmon modes coexist.[13] To solve the technical problems of MIM plasmonic Bragg reflectors (PBRs) with step profiles, sawtooth profiles are proposed and numerical study reveals that they have lower insertion loss, narrower bandgap, and reduced rippling in the transmission spectrum when compared with the step PBRs. The defect mode of the sawtooth PBR exhibits a higher transmission, narrower linewidth, and higher Q-factor.[14].
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