Showing papers by "Richard D. Averitt published in 1997"
TL;DR: In this paper, a coherent description of the optical properties of a unique type of nanoparticles, metal-coated dielectric nanoparticles was presented, and it was shown that the plasmon-related absorption peak undergoes very large shifts in wavelength.
Abstract: In this Letter we present a coherent description of the optical properties of a unique type of nanoparticle, metal-coated dielectric nanoparticles. These structures occur naturally in the form of Au-coated ${\mathrm{Au}}_{2}\mathrm{S}$ nanoparticles. During the course of nanoparticle growth, the plasmon-related absorption peak undergoes very large shifts in wavelength, from $\ensuremath{\sim}650$ to $\ensuremath{\sim}900\mathrm{nm}$. We show that this plasmon peak shift is purely classical in origin and is determined solely by the relative thickness of the Au shell and the ${\mathrm{Au}}_{2}\mathrm{S}$ core diameter. This understanding of the optical properties of these nanoparticles is used to elucidate the nanoparticle growth kinetics.
676 citations