Spaser and optical amplification conditions in gold-coated active nanoparticles.

CORONADO EDUARDO ANDRES; BUSTOS-MARÚN RAUL; NICOLÁS PASSARELLI

Simposio; III simposio de plasmónica; 2016

this presentation we will focus on a particular system which consist of an optically active silica core covered by a gold shell. We found that the spaser condition, where spaser is the acronym for surface plasmonamplification by stimulated emission of radiation, can be calculated from the poles of the scatteringcross section of the system. Similarly to that found by Stockman in the quasi-electrostatic limit, wefound that the spaser conditions always fall on the curves giving the full loss compensation conditionsof the gain versus wavelength plots. We explored over a wide range of parameters, that cover mostof the usual experimental conditions, the gain needed and the wavelength of the spasers that canbe produced by the studied hybrid systems. This can also be used to set these systems as opticalamplifiers. Our results could be useful in numerous applications,in particular, for experiimentalists studying similar systems in both, tuning the experimental conditions and interpreting the results.