Fig. 1. Structural model. (a) Multi-hole periodic silver film array structure; (b) single periodic structure

Fig. 2. Transmission spectrum and electric field distribution of multi-hole periodic silver film array

Fig. 3. Transmission spectra and electric field distribution of central hole and side holes

Fig. 4. Transmission spectra of multi-hole periodic silver film array at different angles

Fig. 5. Electric field distribution, Ex and Ey field distribution at the transmission peak of the proposed structure with different angles. (a)(f)(n) 42°; (b)(j)(z) 65°; (d)(k)(y) 75°; (e)(m)(w) 95°

Fig. 6. Transmission spectra of multi-hole periodic silver film array structure at different diameters of central hole

Fig. 7. Electric field distribution at the transmission peak of the proposed structure with different diameters of central hole. (a) 100 nm; (b) 105 nm; (c) 110 nm; (d) 115 nm; (e) 120 nm

Fig. 8. Transmission spectra of multi-hole periodic silver film array structure at different diameters of side holes

Fig. 9. Electric field distribution at the transmission peak with different diameters of side holes. (a) 50 nm; (b) 55 nm; (c) 60 nm; (d) 65 nm; (e) 70 nm

Fig. 10. Transmission spectra of multi-hole periodic silver film array structure at different thickness

Fig. 11. Electric field distribution at the transmission peak with different thickness of the structure. (a) 50 nm; (b) 60 nm; (c) 70 nm; (d) 80 nm; (e) 90 nm

Fig. 12. Transmission spectra of multi-hole periodic silver film array structure at different space between side holes and central hole

Fig. 13. Electric field distribution at the transmission peak with different space between side holes and central hole. (a) 100 nm; (b) 110 nm; (c) 120 nm; (d) 130 nm; (e) 140 nm; (f) 150 nm

Fig. 14. Transmission spectra of multi-hole periodic silver film array structure at different polarization angles

Fig. 15. Electric field distribution, Ex and Ey field distribution at the transmission peak with different polarization angles. (a)(e)(m) 0°; (b)(f)(n) 30°; (c)(g)(k) 60°; (d)(k)(t) 90°

Fig. 16. Transmission spectra of multi-hole periodic silver film array structure at different environmental refractive index

Fig. 17. Relationship between wavelength position of transmission peak and environmental refractive index