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O: Fachverband Oberflächenphysik
O 9: Plasmonics and Nanooptics I: Local Probes and Raman (joint session O/CPP)
O 9.13: Vortrag
Montag, 16. März 2020, 13:30–13:45, WIL A317
Resonant, plasmonic enhancement of alpha-6T molecules encapsulated in CNTs — •Sören Wasserroth1, Sebastian Heeg1,2, Niclas Mueller1, Patryk Kusch1, Uwe Hübner3, Etienne Gaufrès4, Nathalie Tang4, Richard Martell4, Aravind Vijayaraghavan2, and Stephanie Reich1 — 1Freie Universität Berlin, Berlin, Germany — 2The University of Manchester, Manchester, UK — 3Leibniz IPHT, Jena, Germany — 4Université de Montréal, Montréal, Canada
Surface-enhanced and resonant Raman scattering are widely used techniques to enhance the Raman intensity by several orders of magnitude. SERS uses plasmonic near-fields to enhance the Raman scattering process, whereas electronic transitions are the origin of the enhancement in resonant Raman scattering. Typical Raman reporters in SERS are molecules; in SERS experiments, the intrinsic resonance of the molecules is often ignored. We present a wavelength dependent Raman study of sexithiophenes encapsulated in carbon nanotubes. To distinguish between the intrinsic resonance and plasmonic enhancement we investigate different tube bundles with and without plasmonic near field. The filled nanotubes are placed precisely in a gold dimer gap by dielectrophoretic deposition. Polarization dependent Raman measurements confirmed the alignment of the molecules within the nanotubes and the influence of the plasmonic near-field. By tuning the excitation wavelength, we were able to determine the intrinsic molecular resonance and observed a strong redshift towards the plasmon resonance of maximum Raman intensity under plasmonic enhancement.