General Properties of Local Plasmons in Metal Nanostructures

作者：Feng Wang, Y. R. Shen · 发表于：Physical Review Letters · 年份：2006 · DOI：10.1103/physrevlett.97.206806 · 被引用次数：574 · 研究领域：Plasmonic and Surface Plasmon Research、Gold and Silver Nanoparticles Synthesis and Applications、Surface and Thin Film Phenomena

Under the quasistatic approximation, the characteristics of a local plasmon resonance of a metal nanostructure exhibit several general properties. The resonance frequency depends on the fraction of plasmon energy residing in the metal through the real dielectric function of the metal. For a given resonant frequency, the Q factor of the resonance is determined only by the complex dielectric function of the metal material, independent of the nanostructure form or the dielectric environment. A simple result describing the effect of optical gain on the Q factor is also obtained.