Fig. 1. Absolute value of real part of nonlocal dielectric function for Ag as a function of frequency ω and wavenumber k

Fig. 2. Schematic of simulation model

Fig. 3. EELS spectra of Ag spherical nanoparticles with different radii R obtained from different dielectric models. (a) Results of electron beam penetrating center of nanospheres as indicated in Fig. 2; (b) results of electron beam passing near surface of Ag nanospheres when d=2 nm

Fig. 4. EELS spectra of Ag spherical nanoparticles obtained from different dielectric models when electron beam is outside Ag nanospheres and d=2 nm. (a) R=1 nm; (b) R=18 nm

Fig. 5. (a) Maximum plasmonic resonance peak wavelengths and (b) corresponding extinction coefficients of extinction cross-sections calculated by different dielectric models for Ag spherical nanoparticles with different radii