Fig. 1. Schematic diagram of ipsilateral double LS resonators

Fig. 2. Transmission spectra of MIM waveguide, single LS structure, and ipsilateral double LS resonators

Fig. 3. Transmission properties of ipsilateral double LS waveguide structure. (a) Transmission spectra; (b) transmission phase shift; (c)--(i) magnetic field distributions for D=60 nm at different wavelengths of 734, 760, 770, 799, 837, 845, and 857 nm, respectively

Fig. 4. Transmission properties of ipsilateral double LS waveguide structure for D=0 nm. (a) Transmission spectra; (b) transmission phase shift; (c)--(g) magnetic field distributions at different wavelengths of 706, 764, 793, 811, 838 nm, respectively

Fig. 5. Effect of parameters on transmission spectra. (a) Length L_h2 of right horizontal branch; (b) width G_v of vertical branch; (c) length L_h of total horizontal branch; (d) width G_h of horizontal branch

Fig. 6. Transmission spectra of ipsilateral double LS resonator waveguide structure. (a) G_v=50 nm, L_v=460 nm, G_h=100 nm, L_h1=190 nm, L_h2=140 nm, and D =30 nm; (b) G_v=50 nm, L_v=460 nm, G_h=80 nm, L_h1=180 nm, L_h2=140 nm, and D=0 nm

Fig. 7. Schematic diagram of opposite side double LS resonators

Fig. 8. Transmission properties of opposite side double LS resonator waveguide structure. (a) Transmission spectra; (b) transmission phase shift; (c)--(i) magnetic field distributions for H=0 nm at different wavelengths of 743, 761, 780, 813, 829, 852, and 887 nm, respectively

Fig. 9. Schematic diagram of antisymmetric double LS resonators

Fig. 10. Transmission properties of antisymmetric double LS resonator waveguide structure. (a) Transmission spectra; (b) transmission phase shift; (c)(d) magnetic field distributions for d=20 nm at different wavelengths of 725 nm and 766 nm, respectively