Anisotropic Decay Dynamics of Photoexcited Aligned Carbon Nanotube Bundles

Details Anisotropic Decay Dynamics of Photoexcited Aligned Carbon Nanotube Bundles Anisotropic Decay Dynamics of Photoexcited Aligned Carbon Nanotube Bundles

2006-12-31

arxiv.org/abs/cond-mat/0701012v1

Physical Review B 75, 245408 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.75.245408

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.

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