= Gold nanoring
A <gold nanoring> is a ring-shaped <gold> nanostructure whose central opening and wall dimensions alter its response to <light>. Charge oscillations associated with its inner and outer surfaces couple, changing its <localized surface plasmon resonance> relative to that of a compact particle.<Optical Properties of Gold Nanorings by Javier Aizpurua and others>[Abstract, measured resonance shifts and coupled surface modes]{ref}
The 2003 experiments and modelling showed that varying the ring geometry shifts the optical resonance. Comparing rings with different wall-thickness-to-radius ratios thus tests a geometric mechanism while retaining the same elemental material. A measured colour or spectral peak must be interpreted together with geometry and the surrounding <dielectric>, not as a unique measure of overall particle diameter.<Optical Properties of Gold Nanorings by Javier Aizpurua and others>[Geometry-dependent optical response]{ref}
Back to article page
