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Peculiar ring gap modes on the surface of disk close to the metallic thinfilm are excited in the visible light regime. We apply plasmon hybridizationmethod to illustrate the ring gap modes arising from the interaction betweenlocalized disk plasmons and continuum surface plasmons, which cannot be easilyexcited by the plane wave with polarization parallel to the film interface. Inthe coupled system, the hybrid modes energy and the surface charge distributionof nanoparticle are investigated both in simulation and hybridization method,showing consistence with each other. The excitation of ring gap modes providesfurther insight into strong coupling of the plasmon and the design of novelnanostructures.

Ring gap resonant modes on disk/film coupling system caused by strong interaction