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O: Fachverband Oberflächenphysik

O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures

O 37.8: Poster

Dienstag, 1. April 2014, 18:30–22:00, P2

Spectral properties of ordered nano-particle assemblies — •Simon Dickreuter, Emre Gürdal, Dieter Kern, and Monika Fleischer — Institute for Applied Physics, Eberhard Karls University of Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany

Plasmonic nano-particles have proven to be useful for many applications like bio-sensing or near-field imaging. But due to their complex nature they are not yet fully understood. In this recently started project, the coupling between colloidal nano-particles is investigated. The plasmonic properties of single gold-colloids are well known, thus we chose gold-colloids as the building blocks for the fabrication of nano-particle assemblies. The techniques of e-beam lithography and diblock copolymer self-assembly are employed to fabricate ordered hole arrays, which can be filled with colloidal nano-particles by using capillary or convective self-assembly. This way controlled assembly of nano-particles inside the holes is possible. By choosing different geometries for the templates, one can fabricate oligomers consisting of a defined number of nano-particles. The assemblies are analyzed by dark-field spectroscopy to see how the coupling of several nano-particles affects the plasmonic resonances they exhibit. The methods of fabrication of the assemblies and first dark-field spectra will be presented.