Anisotropic Decay Dynamics of Photoexcited Aligned Carbon Nanotube Bundles

Abstract

We have performed polarization-dependent ultrafast pump-probe spectroscopy of a film of aligned single-walled carbon nanotube bundles. By taking into account imperfect nanotube alignment as well as anisotropic absorption cross sections, we quantitatively determined distinctly different photo-bleaching dynamics for polarizations parallel and perpendicular to the tube axis. For perpendicular polarization, we observe a slow (1.0-1.5 ps) relaxation process, previously unobserved in randomly-oriented nanotube bundles. We attribute this slower dynamics to the excitation and relaxation of surface plasmons in the radial direction of the nanotube bundles.

arXiv comment4 pages, 3 figures

References in corpus (4)

• Charge-carrier dynamics in single-wall carbon nanotube bundles: A time-domain study
• Electronic structure and dynamics of optically excited single-wall carbon nanotubes
• Stability of 1-D Excitons in Carbon Nanotubes under High Laser Excitations
• Influence of excited electron lifetimes on the electronic structure of carbon nanotubes