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

被引：50
作者：
Rozhin, AG
Sakakibara, Y
Kataura, H
Matsuzaki, S
Ishida, K
Achiba, Y
Tokumoto, M
机构：
[1] AIST, Photon Res Inst, Tsukuba, Ibaraki 3058565, Japan
[2] Tokyo Univ Sci, Fac Sci & Technol, Noda, Chiba 2788510, Japan
[3] Tokyo Metropolitan Univ, Grad Sch Sci, Hachioji, Tokyo 1920397, Japan
来源：
CHEMICAL PHYSICS LETTERS | 2005年 / 405卷 / 4-6期
基金：
日本学术振兴会;
关键词：
D O I：
10.1016/j.cplett.2005.02.049
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We dispersed single-wall carbon nanotubes (SWNTs) in polyvinyl alcohol (PVA) film mostly with nanoscale uniformity and mechanically stretched it. Polarized absorption spectra showed strong anisotropy in the near-infrared band gap transition of semiconductor SWNT with a dichroic ratio of 7.4, indicating good alignment of the embedded SWNT. The saturable absorption property of the band gap transition measured using a polarized femtosecond laser showed strong dependence on the polarization angle. When the polarization of the light was parallel to the stretching direction, the saturation power was 2.6 times smaller than that of the unstretched film, which we ascribed to the increased transition probability. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：288 / 293
页数：6
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