Modulation of the Transmission Spectra of the Double-Ring Structure by Surface Plasmonic Polaritons

Figure 1

Schematic diagram of the proposed structure: double-ring aperture at the center of the silver film surrounded by periodic concentric-ring grooves, top view (a) and side view (b); schematic diagram of the reference aperture-only structure: double-ring aperture at the center of the silver film, top view (c) and side view (d); schematic diagram of the bull’s eye structure, top view (e) and side view (f).

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