Fig. 1. Structural diagrams of plasmonic curve waveguides. (a) Disk cavity coupled curve waveguide;(b) embedded-silver-bar disk cavity coupled curve waveguide

Fig. 2. Transmission spectrum and electric filed intensity distribution of structure 1.(a) Transmission spectrum; (b) electric filed intensity distribution

Fig. 3. Transmission spectrum and Hz and Ez filed distributions at different resonant wavelengths of structure 2. (a) Transmission spectrum; (b) Hz filed distribution at λ=842 nm; (c) Hz filed distribution at λ= 1125 nm; (d) Ez filed distribution at λ= 842 nm; (e) Ez filed distribution at λ=1125 nm

Fig. 4. Influence of parameter r on filtering characteristics. (a) Transmission spectra at different r;(b) resonant wavelength versus r

Fig. 5. Influence of parameter h on filtering characteristics. (a) Effective refractive index of waveguide versus incident wavelength and waveguide width; (b) transmission spectra under different h

Fig. 6. Influence of coupling pitch on filtering characteristics. (a) Transmission spectra of filter under different s2 when s1=10 nm; (b) transmission spectra of filter under different s1 when s2=10 nm

Fig. 7. Influence of refractive index n on filtering characteristics. (a) Transmission spectra of cavity filled with different media; (b) resonant wavelength versus refractive index of medium