Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 90: Sensing, Active Structures and other Applications

O 90.8: Vortrag

Donnerstag, 19. März 2015, 16:45–17:00, MA 144

Resonant optical antennas for directional Raman studies of carbon nanotubes — •Nicola Paradiso, Fatemeh Yaghobian, Christoph Lange, Tobias Korn, Christian Schüller, Rupert Huber, and Christoph Strunk — Institut für Experimentelle und Angewandte Physik, University of Regensburg

We use optical nano-antennas in order to manipulate light on the sub-wavelength scale. These nanoplasmonic excitations allows us to fully control both amplitude and polarization direction for the incident and scattered light in micro-Raman experiments. Our directional antennas are particularly promising when applied to carbon nanotubes (CNTs), owing to the stronlgy anisotropical optical behavior of CNTs. In particular nano-antennas enable the Raman characterization of individual CNTs that would be otherwise not optically detectable. Our experimental results are discussed together with numerical simulations which reproduce the observed amplification and rotation of the incident optical field.