Fig. 1. Structure diagram. (a) (c) (e) (g) (i) Side views; (b) (d) (f) (h) (j) top views

Fig. 2. Changes of total emission rates and radiative ones of one single gold nanoparticle with radius. (a) Total radiation rates; (b) far-field radiation rates

Fig. 3. Comparison of emission rates of different nanostructures. (a)(d)(g)(i) Sketch of different number of gold nanoparticles; (b)(e)(h)(k) total emission rates plotted as functions of d; (c)(f)(i)(l) far-field radiative emission rates plotted as functions of d

Fig. 4. Radiation direction analysis of a single gold nanoparticle. (a) Structure sketch; (b) far-field radiation pattern

Fig. 5. Changes of far-field radiation pattern of double gold nanoparticles on metal substrate with increasing distance

Fig. 6. Changes of far-field radiation pattern of three gold nanoparticles on metal substrate with increasing distance

Fig. 7. Changes of far-field radiation pattern of five gold nanoparticles on the metal substrate with increasing distance

Fig. 8. Changes of far-field radiation pattern of nine gold nanoparticles on metal substrate with increasing distance