Berlin 2012 – scientific programme

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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 34.48: Poster

Tuesday, March 27, 2012, 18:15–21:45, Poster E

Interaction of Carbon Nanotubes with periodic Plasmonic Surfaces — •Christian Lehmann, Eser Akinoglu, Michael Giersig, and Stephanie Reich — FU Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin

We investigate the interaction of carbon nanotubes with plasmonic particles using Raman spectroscopy. Our goal is to understand the influence of the shape and dielectric environment of the plasmonic particles on the Raman signal. Therefore we use shadow nanosphere lithography to create plasmonic surfaces with homogeneously shaped triangular gold particles aligned in a hexagonal lattice structure. Depending on the deposition parameters, the plasmonic resonance was shifted to available excitation wavelengths for Raman measurements. The parameters were obtained by finite difference time domain simulations, which agree well with the measured resonances. The resonances were obtained using dark field and UV/VIS absorption spectroscopy. As marker molecules we used carbon nanoubes because of their well known Raman spectrum. We observed an additional plasmonic amplification of the Raman signal. The effect was observed only when the particle was in resonance with the exciting laser wavelength. Under certain conditions additional Raman modes were observed. These modes are strongly dependend on the distance between the carbon nanotube and the plasmonic particles. We will discuss the origin of these additional modes. Furthermore, a strong luminescence amplification of the gold particles was observed for certain shapes. It is likely that this effect originates from clustering of the gold particles.