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(a) Geometry of a pentamer composed of nanorings. (b) Evolution of the extinction spectra versus center ring radius R when the polarization is along the x-axis, and the (c) y-axis, where the surrounding ring radius r = 75 nm, the width w = 30 nm, the separation s = 20 nm, the angle between the center and the surrounding rings θ = 60°, the thickness t = 40 nm, and the environment refractive index n = 1.33.
Near field enhancement and current density vector distributions at the spectral positions of the superradiant bright mode and the three kinds of Fano resonances. (a) The bright mode with incident wavelength λ = 830 nm and (b) λ = 1360 nm. (c) The first Fano resonance with R = 60 nm and (d) R = 90 nm. (e) The second Fano resonance with R = 80 nm and (f) R = 90 nm. (g) The third Fano resonance with R = 60 nm and (h) R = 70 nm. The inset in Fig. 2(d) schematically shows the other normal mode of B 3u irreducible representation.
Relationships between the extinction spectra and θ. (a) R = 60 nm, (b) R = 90 nm. The other parameters are the same as those in Fig. 1 .
Near field enhancement and current density vector distributions of the Fano resonances with different θ. (a) The second Fano resonance with θ = 90°, R = 60 nm. (b) The third Fano resonance with θ = 70°, R = 60 nm. (c) The second Fano resonance with θ = 90°, R = 90 nm. (d) The third Fano resonance with θ = 50°, R = 90 nm.
(a) Extinction spectra of the pentamers composed of split nanorings, where the gap size of split rings g = 30 nm and the other parameters are the same as those in Fig. 1 . (b) Near field properties of the second Fano resonance, (c) the third Fano resonance, and (d) the fourth Fano resonance.
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