Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 98: Plasmonics and Nanooptics V

O 98.5: Talk

Friday, April 4, 2014, 11:30–11:45, TRE Ma

Linear colloidal assemblies with adjustable dimensions and plasmonics — •Christoph Hanske, Moritz Tebbe, Vera Bieber, Mareen Müller, Munish Chanana, Nicolas Pazos-Perez, and Andreas Fery — Physical Chemistry II, University of Bayreuth, 95440 Bayreuth, Germany

Topographical templating is a powerful technique to assemble simple colloids into complex structures with advanced optical functionality. We present the fabrication of linear colloidal arrangements by convective assembly of spherical particles on wrinkled substrates. The method does not rely on conventional lithographic processes and yields highly regular structures over macroscopic areas.[1] In a subsequent transfer step additional features with micron- or even submicron-sized dimensions can be introduced through the use of patterned target substrates.[2] We discuss the role of the underlying surface chemistry and demonstrate how this assembly strategy can be employed to manipulate the plasmonic properties of metallic nanoparticles. In UV-Vis/NIR investigations linear arrangements of close-packing spherical gold particles display a pronounced polarization dependent spectral response. The observed anisotropy is caused by strong plasmonic coupling between adjacent particles and can be described in analogy to the transversal and longitudinal modes common for gold nanorods.