Skip to Main Content

Aspect-Ratio- and Size-Dependent Emergence of the Surface-Plasmon Resonance in Gold Nanorods- an ab initio TDDFT Study

TitleAspect-Ratio- and Size-Dependent Emergence of the Surface-Plasmon Resonance in Gold Nanorods- an ab initio TDDFT Study
Publication TypeJournal Article
Year of Publication2013
AuthorsLopez Lozano, X., Barron H., Mottet C., & Weissker H. - C.
Abstract

It is known that the surface-plasmon resonance (SPR) in small spherical Au nanoparticles of about 2 nm is strongly damped. We demonstrate that small Au nanorods of high aspect ratio develop a strong longitudinal SPR, of intensity comparable to that in Ag rods, as soon as the resonance energy drops below the onset of the interband transitions due to the geometry. We present ab initio calculations of time-dependent density-functional theory of rods with lengths of up to 7 nm. Changing length and width, not only the energy but also the character of the resonance in Au rods can be tuned. Moreover, the aspect ratio alone is not sufficient to predict even the character of the spectrum; the absolute size matters.

JournalPhys. Chem. Chem. Phys.
URLhttp://dx.doi.org/10.1039/c3cp53702a
Date Published2013/01
User Project

UP69

Beamlines

optics

Citation Key1675