Fig. 1. Metal circular arc hole array structure. (a) Three-dimensional schematic; (b) two-dimensional schematic of x-y section; (c) transmittance as a function of wavelength for three different structures; (d)-(f) electric-field energy density distributions at transmission peak wavelengths

Fig. 2. (a) Transmittance as a function of wavelength for compound circular arc hole array at different R when r=55 nm and d=105 nm; (b) relationship between λpeak or Tpeak and R

Fig. 3. (a) Transmittance as a function of wavelength for compound circular arc hole array at different r when R=95 nm and d=105 nm; (b) relationship between λpeak or Tpeak and r

Fig. 4. (a) Transmittance as a function of wavelength for compound circular arc hole array at different d when R=95 nm and r=70 nm; (b) relationship between λpeak or Tpeak and d; (c)-(g) electric-field energy density distributions at different transmission peak wavelengths

Fig. 5. Transmittance as a function of wavelength for compound circular arc hole array at different P when R=95 nm, r=70 nm, and d=100 nm; (b) relationship between λpeak or Tpeak and P

Fig. 6. Transmittance as a function of wavelength for compound circular arc hole array at different refractive indices when R=95 nm, r=70 nm, d=100 nm, and P=425 nm; (b) relationship between λpeak and refractive index