title: Formation and plasmonic response of self-assembled layers of colloidal gold nanorods and branched gold nanoparticles.
abstract: The plasmonic properties of self-assembled layers of rod- and branched-shaped gold nanoparticles were investigated using optical techniques. Nanoparticles were synthesized by a surfactant-guided, seed-mediated growth method. The layers were obtained by gradual assembly of nanoparticles at the interface between a polar and a nonpolar solvent and were transferred to a glass slide. Polarization and angle-dependent extinction measurements showed that the layers made of gold nanorods were governed by an effective medium response. The response of the layers made by branched gold particles was characterized by random light scattering. Microscopic mapping of the spatial mode structure demonstrates a uniform optical response of the nanoparticle layers down to a submicrometer length scale.
authors.affiliation: SEPnet and Physics and Astronomy, Faculty of Applied and Physical Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom.
authors.forename: K Marvin
authors.initials: KM
authors.lastname: Schulz
authors.forename: Sabine
authors.initials: S
authors.lastname: Abb
authors.forename: Rute
authors.initials: R
authors.lastname: Fernandes
authors.forename: Martina
authors.initials: M
authors.lastname: Abb
authors.forename: Antonios G
authors.initials: AG
authors.lastname: Kanaras
authors.forename: Otto L
authors.initials: OL
authors.lastname: Muskens
mesh_terms: D003102:Colloids / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D008567:Membranes, Artificial; D053768:Metal Nanoparticles / Q000737:chemistry*; D043942:Nanotubes / Q000737:chemistry*; D010316:Particle Size; D020349:Surface Plasmon Resonance; D013499:Surface Properties
chemical_list: D003102:Colloids; D008567:Membranes, Artificial; D006046:Gold