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Anisotropic saturable absorption of single wall carbon nanotubes aligned in polyvinyl alcohol

Published online by Cambridge University Press:  01 February 2011

Aleksey G. Rozhin ,
Youichi Sakakibara ,
Hiromichi Kataura ,
Shun Matsuzaki ,
Kohtaro Ishida ,
Yohji Achiba  and
Madoka Tokumoto
Aleksey G. Rozhin
Affiliation:
National Institute of Advanced Industrial Science and Technology (AIST), 1–1–1 Higashi, Tsukuba, Ibaraki 305–8565, Japan
Youichi Sakakibara
Affiliation:
National Institute of Advanced Industrial Science and Technology (AIST), 1–1–1 Higashi, Tsukuba, Ibaraki 305–8565, Japan
Hiromichi Kataura
Affiliation:
National Institute of Advanced Industrial Science and Technology (AIST), 1–1–1 Higashi, Tsukuba, Ibaraki 305–8565, Japan
Shun Matsuzaki
Affiliation:
Faculty of Science and Technology, Tokyo University of Science, Noda 278–8510, Japan
Kohtaro Ishida
Affiliation:
Faculty of Science and Technology, Tokyo University of Science, Noda 278–8510, Japan
Yohji Achiba
Affiliation:
Graduate School of Science, Tokyo Metropolitan University, 1–1 Minami–Ohsawa, Hachioji, Tokyo 192–0397, JAPAN
Madoka Tokumoto
Affiliation:
National Institute of Advanced Industrial Science and Technology (AIST), 1–1–1 Higashi, Tsukuba, Ibaraki 305–8565, Japan Faculty of Science and Technology, Tokyo University of Science, Noda 278–8510, Japan
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Abstract

We report anisotropic optical absorption and saturable absorption (SA) properties of aligned single wall carbon nanotubes (SWNT) embedded in the mechanically stretched polyvinyl alcohol (PVA) film. Polarized absorption spectra of the film showed a strong anisotropy for the near-infrared band gap transition of semiconductor SWNT with a dichroic ratio of 7.4, indicating the good alignment of the embedded SWNT. The SA property of the band gap transition measured using a polarized femtosecond fiber laser showed a strong polarization angle dependence for the stretched film. When the polarization of light is parallel to the stretching direction, the absorption saturation of the stretched film became more efficient than that of the unstretched film because of the apparently stronger transition moment.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 858: Symposium HH – Functional Carbon Nanotubes , 2004 , HH10.6
Copyright
Copyright © Materials Research Society 2005

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References

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