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Phys. Rev. B 75, 245408 (2007) [5 pages]

Anisotropic decay dynamics of photoexcited aligned carbon nanotube bundles

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Y. Hashimoto1,2,*, Y. Murakami1,3, S. Maruyama3, and J. Kono1,†
1Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, USA
2Graduate School of Science and Technology and Venture Business Laboratory, Chiba University, Chiba 263-8522, Japan
3Department of Mechanical Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

Received 30 December 2006; revised 7 April 2007; published 7 June 2007

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 photobleaching 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.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.75.245408
DOI:
10.1103/PhysRevB.75.245408
PACS:
73.22.−f, 78.47.+p, 78.67.Ch

*Present address: Imaging Science and Engineering Laboratory, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8503, Japan.

†Author to whom correspondence should be addressed. URL: http://www.ece.rice.edu/∼kono. Electronic address: kono@rice.edu

 
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