Figure 1
From: Unidirectional Spaser in Symmetry-Broken Plasmonic Core-Shell Nanocavity
Light radiation from a metal semishell-capped spaser nanocavity.
The silver shell generates LSPs; the core provides optical gain to compensate for plasmon losses. Here the core is assumed to be silica doped with an optical gain material with refractive index ñd = 1.52 + iκ, κ = −0.062 for this image. The radius of the core is R = 100 nm and the shell thickness is t = 10 nm. Spaser emission (colored beam) is unidirectional along the axis of the semishell as shown.
