Minimal spaser threshold within electrodynamic framework: Shape, size and modes.

ABSTRACT: It is known (yet often ignored) from quantum mechanical or energetic considerations, that the threshold gain of the quasi-static spaser depends only on the dielectric functions of the metal and the gain material. Here, we derive this result from the purely classical electromagnetic scattering framework. This is of great importance, because electrodynamic modelling is far simpler than quantum mechanical one. The influence of the material dispersion and spaser geometry are clearly separated; the latter influences the threshold gain only indirectly, defining the resonant wavelength. We show that the threshold gain has a minimum as a function of wavelength. A variation of nanoparticle shape, composition, or spasing mode may shift the plasmonic resonance to this optimal wavelength, but it canno

SUBMITTER: Arnold N 

PROVIDER: S-EPMC4834728 | biostudies-literature | 2016 Apr

REPOSITORIES: biostudies-literature