Fig. 1. C-type curved metal circular hole array structural model. (a) Figure of 3×3 metal circular hole; (b) single C-type circular hole

Fig. 2. Calculation results of C-type curved metal circular hole array as a₀ = 1000 nm, R = 200 nm, H = 800 nm, and L= 280 nm.(a) Transmission spectrum with wavelength range of 200‒600 nm; (b) reflectance, transmittance, and absorptivityaround 284.2 nm

Fig. 3. Distribution of E_yin the x-y plane at different z as λ=284.2 nm

Fig. 4. E_y distribution of C-type curved metal circular hole array. (a) E_y in the x-z plane for different y as λ=284.2 nm; (b) E_y in the y-z plane for different λ as x=0

Fig. 5. Transmittance, reflectance, and absorptivity of C-type curved metal circular hole arrayaround 438.0 nm as a₀=1000 nm,R=200 nm,H=800 nm, and L= 280 nm

Fig. 6. Distribution of E_y in the x-y plane at different z as λ=438.0 nm

Fig. 7. E_y distribution of C-type curved metal circular hole array. (a) E_y in the x-z plane for different y as λ=438.0 nm; (b) E_y in the y-z plane for different λ as x=0

Fig. 8. Evolution of maximum transmittance S₂₁ of C-type curved metal circular hole array with L

Fig. 9. Evolution of Es with s for different ρ as R=200 nm, λ=780 nm

Fig. 10. Evolution of Eρ with ρ for different R as λ= 780 nm, s=1000 nm

Fig. 11. Evolution of transmittance phase and the derivative with wavelength. (a) When R=200 nm,H=800 nm,L=0,long straight array with λ near 328.4 nm; (b) when R=200 nm,H=800 nm,L=280 nm,C-type curved metal circular hole array with λ near 283.1 nm; (c) when R=200 nm,H=800 nm,L=280 nm,C-type curved metal circular hole array with λ near 442.1 nm

Fig. 12. Dispersion curves of ideal photon, SPP, waveguide mode, and tunneling mode