title: Bottom-up assembly of colloidal gold and silver nanostructures for designable plasmonic structures and metamaterials.
abstract: We report on bottom-up assembly routes for fabricating plasmonic structures and metamaterials composed of colloidal gold and silver nanostructures, such as nanoparticles ("metatoms") and shape-controlled nanocrystals. Owing to their well-controlled sizes/shapes, facile surface functionalization, and excellent plasmonic properties in the visible and near-infrared regions, these nanoparticles and nanocrystals are excellent building blocks of plasmonic structures and metamaterials for optical applications. Recently, we have utilized two kinds of bottom-up techniques (i.e., multiple-probe-based nanomanipulation and layer-by-layer self-assembly) to fabricate strongly coupled plasmonic dimers, one-dimensional (1D) chains, and large-scale two-dimensional/three-dimensional (2D/3D) nanoparticle supercrystals. These coupled nanoparticle/nanocrystal assemblies exhibit unique and tunable plasmonic properties, depending on the material composition, size/shape, intergap distance, the number of composing nanoparticles/nanocrystals (1D chains), and the nanoparticle layer number in the case of 3D nanoparticle supercrystals. By studying these coupled nanoparticle/nanocrystal assemblies, the fundamental plasmonic metamaterial effects could be investigated in detail under well-prepared and previously unexplored experimental settings.
authors.affiliation: Department of Physics, National Tsing-Hua University, Hsinchu 30013, Taiwan. gwo@mx.nthu.edu.tw
authors.forename: Shangjr
authors.initials: S
authors.lastname: Gwo
authors.forename: Meng-Hsien
authors.initials: MH
authors.lastname: Lin
authors.forename: Chieh-Lun
authors.initials: CL
authors.lastname: He
authors.forename: Hung-Ying
authors.initials: HY
authors.lastname: Chen
authors.forename: Toshiharu
authors.initials: T
authors.lastname: Teranishi