Regensburg 2016 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 33: Photonics and Nanooptics I: Infrared Spectroscopy

O 33.1: Vortrag

Dienstag, 8. März 2016, 10:30–10:45, H4

Directional Pt-Re nano-antennas for surface-enhanced Raman spectroscopy of suspended ultraclean carbon nanotubes — •Christian Bäuml, Nicola Paradiso, Tobias Korn, Christian Schüller, and Christoph Strunk — University of Regensburg

We developed a new kind of directional optical nano-antennas based on arrays of nano-strips of platinum-rhenium bilayers. The arrays are designed in order to display a plasmonic resonance when excited with light at around 633 nm with polarization directed orthogonally to the strips. We demonstrate that these structures retain their plasmonic resonance even if subjected to very high temperatures (850°C). This feature allowed us to dramatically amplify the Raman signal on carbon nanotubes (CNTs) grown on top of the antennas via chemical vapor deposition. Such overgrowth technique is nowadays the standard method to produce clean devices for quantum transport experiments. Our antennas are thus a promising building block for hybrid devices that enable amplification of optical signals detected on the very CNT portion investigated in transport experiments by the same device.