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Schematic diagram of the plasmonic WRR. The incident wave is introduced in the input dielectric waveguide with a refractive index of and a width of . denotes the ring radius of the WRR. The thicknesses of dielectric cladding in the ring and output waveguides are both . The refractive indices of them are and , respectively. and denote the gaps between the input and output waveguides and the resonant ring, respectively. Ports 1 and 2 present the planes where the power transmission from the input and output waveguides is detected.
(Color online) Power transmission from (a) port 1 at the input waveguide and (b) port 2 at the output waveguide as a function of frequency for plasmonic WRR with dielectric claddings (green dots, , ) and without dielectric claddings (blue squares, ), respectively. Both WRRs have a radius of and the gaps and .
(Color online) Magnetic field distributions in the WRR for (a) and (b) . The parameters labeled in Fig. 1 are given as , , , , , and .
(Color online) Resonant frequencies (left) and FSR (right) of the WRR as a function of the ring radius.
(Color online) Dependence of power transmission from ports 1 and 2 on (a) the refractive index of the input waveguide for , (b) the gap between the input and the ring waveguides for , and (c) the gap between the output waveguide and the resonant ring for and . Other parameters are the same as that used in Fig. 3(b).
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