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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Organic films and electronics, photoorganics; Nanostructures; Plasmonics and nanooptics, Surface chemical reactions and heterogeneous catalysis, Surface dynamics )

O 36.44: Poster

Dienstag, 12. März 2013, 18:15–21:45, Poster B2

Dark-field spectroscopy and simulation of plasmonic modes in single nanostructures — •Andreas Horrer, Christian Schäfer, Dominik A. Gollmer, Julia Fulmes, Dieter P. Kern, and Monika Fleischer — Institute for Applied Physics, Eberhard Karls University of Tuebingen, Auf der Morgenstelle 10, 72076 Tuebingen, Germany

Due to their strongly localized electrical fields and sharp resonances in the optical or infrared range, plasmonic nanostructures provide a promising platform for many applications, for example the detection of molecules with high sensitivity. For such applications it is crucial to be able to fabricate structures with well-defined sizes and shapes in a controlled manner and to understand their plasmonic resonances. Dark-field spectroscopy, where scattered light from individual nanoparticles can be detected in the far field, is a highly useful method for the study of the plasmonic modes of such structures. Different plasmonic nanostructures like gold nanocones, nanotriangles or nanodiscs were fabricated with varying sizes and aspect ratios and the optical properties of single structures were investigated by dark-field spectroscopy. For the characterization of the plasmonic modes of the nanostructures the spectra were compared to the results of finite element method based simulations of the structures in differently polarized electromagnetic fields. An overview over different structures, their spectral properties and corresponding numerical simulations will be presented.