Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 74: Plasmonics and nanooptics IV
O 74.4: Talk
Thursday, March 29, 2012, 16:45–17:00, MA 005
Coupling of Excitons in Carbon Nanotubes to Propagating Surface Plasmons — •Nicolai Hartmann1, Johann Berthelot2, Padmnabh Rai2, Francesco Tantussi3, Francesco Fuso3, Maria Allegrini3, Alexandre Bouhelier2, and Achim Hartschuh1 — 1Department Chemie and CeNS, Ludwig-Maximilians-Universität, München, Germany — 2Département Nanosciences, Université de Bourgogne, Dijon, France — 3Dipartimento di Fisica E. Fermi, Università di Pisa, Italy
We report on the coupling between excitonic states in semiconducting single-walled carbon nanotubes and propagating surface plasmons in thin metal films.
First we show that upon optical excitation in the visible regime a single carbon nanotube acts as a directive near-infrared dipolar source for surface plasmons propagating mainly along the direction of the nanotube axis. Plasmon excitation and propagation is monitored in Fourier and real space by leakage radiation microscopy [1, 2] and is modelled by rigorous theoretical calculations. Coupling to plasmons almost completely reshapes the emission of nanotubes both spatially and with respect to polarization as compared to photoluminescence on a dielectric substrate. Second we visualize the remote excitation of single nanotubes via propagating surface plasmons.
Our results demonstrate the potential of carbon nanotubes as active elements in plasmonic circuits.
[1] B. Hecht, et.al., Phys. rev. Lett. 77, 1889 (1996) [2] M. Böhmler, et.al., Opt. Express 18, 16443 (2010)