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O: Fachverband Oberflächenphysik

O 34: Poster Session I (Graphene; Plasmonics and nanooptics; Coherence and coherent control in nanophotonics and plasmonics)

O 34.32: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster E

Comparative study of localized surface plasmons in gold ring structures performed by SNOM and PEEM. — •Cristian Gonzalez, Daniela Bayer, Pascal Melchior, Alexander Fischer, Christian Schneider, Bernhard Schaaf, Egbert Oesterschulze, and Martin Aeschlimann — University of Kaiserslautern, Department of Physics, 67663 Kaiserslautern, Germany

We will present a first comparative study on plasmonic nanostructures performed by SNOM (Scanning Near-field Optical Microscopy) and PEEM (Photo-Electron Emission Microscopy). Our new PEEM setup allows measurements under normal and 65^∘ incidence of the laser beam. Hence, we are able to compare directly local near field enhancement in the vicinity of nanostructures obtained by both techniques, PEEM and SNOM under the same geometrical conditions.

With these two complementary microscopy techniques, we have the possibility to address both plasmonic damping channels, the radiative channel by SNOM and the non-radiative channel (electron-hole pair creation) by PEEM. In our first studies we focus on Au ring structures and ring segmented arrays made by electron beam lithography deposited on Indium Tin Oxide (ITO). Ring structures are of special interest because of the high tunability of their optical properties. Besides the interest in fundamental physics of the excitation of multipolar modes, they can be implemented in technological applications as, for example, bio-sensors and resonators.