Fig. 1. Simulation schematic of AgNPs/CNTs composite structure

Fig. 2. Dielectric permittivity and refractive index of the metallic CNTs varying with wavelength

Fig. 3. Electric field distributions of AgNPs/CNTs with different Ag nanoparticles sizes (d=2 nm, λ=532 nm)

Fig. 4. Maximum electric field intensities of AgNPs/CNTs and AgNPs versus sizes of AgNPs

Fig. 5. Electric field distributions of AgNPs/CNTs at different gaps of AgNPs (DAg=60 nm, λ=532 nm)

Fig. 6. Maximum electric field intensities of AgNPs/CNTs and AgNPs versus different gaps of AgNPs

Fig. 7. Electric field distributions of AgNPs/CNTs at different excitation wavelengths (d=2 nm, DAg=60 nm)

Fig. 8. Maximum electric field intensities of AgNPs/CNTs and AgNPs versus excitation wavelength

Fig. 9. Electric field distributions of AgNPs/CNTs with different base materials (DAg=60 nm)

Fig. 10. Raman spectra of different base materials with R6G concentration of 10-10 mol/L