Figure 1

The system under study: a single, homogeneous spherical nanoparticle made of metal (in light gray), immersed in an active host medium made of many active dipolar elements (red dots) dispersed into a background dielectric host.
The system under study: a single, homogeneous spherical nanoparticle made of metal (in light gray), immersed in an active host medium made of many active dipolar elements (red dots) dispersed into a background dielectric host.