Amplification regimes and SPASER emission in gain enhanced silver nano-shells.

Caicedo K., Cathey A., Aradian A., Veltri A.

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The Gain enhanced Nano-Shell, a metal nano-particle constituted by a gain rich dielectric core covered by a metal shell, is one of the most promising designs for the realization of the Surface Plasmon Amplification by Stimulated Emission of Radiation or SPASER: the plasmonic equivalent of the LASER. In this work, we present a time-dynamical set of equations for the plasmonic field around such a particle and use it to discuss the stability of the widely accepted SPASER solution. We also show the existence of additional regimes of amplification and stimulated emission which are, to our knowledge, passed unnoticed until now.

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