DNA-directed self-assembly and optical properties of discrete 1D, 2D and 3D plasmonic structures

We review recent progress on the assembly of metal nanocrystals using dithiol and DNA based bifunctional linkers to create discrete plasmonic superstructures. The structures formed include one-dimensional linear arrays, two-dimensional trimers and tetramers as well as stable three-dimensional assemblies built up on a substrate. We outline specific aspects and challenges within the DNA-assembly technique, including control of the desired interparticle spacing. The optical properties of a number of general classes of assemblies are described and the consequences of symmetry-breaking, such as the formation of Fano-like resonances. The assembly and optical properties of unique three-dimensional structures are described along with a hybrid top-down and bottom-up technique for obtaining long, linear arrays of crystalline metal nanoparticles. (C) 2013 Elsevier Ltd. All rights reserved.