Anisotropic decay dynamics of photoexcited aligned carbon nanotube bundles

Y. Hashimoto, Y. Murakami, S. Maruyama, and J. Kono

Phys. Rev. B 75, 245408 – Published 7 June 2007

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 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.

Received 30 December 2006

DOI:https://doi.org/10.1103/PhysRevB.75.245408

Authors & Affiliations

Y. Hashimoto^1,2,*, Y. Murakami^1,3, S. Maruyama³, and J. Kono^1,†

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

^*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

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand

Issue

Vol. 75, Iss. 24 — 15 June 2007

Reuse & Permissions

Access Options

Author publication services for translation and copyediting assistance advertisement

Physical Review B

covering condensed matter and materials physics