Anisotropic decay dynamics of photoexcited aligned carbon nanotube bundles
Anisotropic decay dynamics of photoexcited aligned carbon nanotube bundles
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DOI：
10.1103/physrevb.75.245408
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发表时间：
2007-06-01
影响因子：
3.7
通讯作者：
Kono, J.
中科院分区：
文献类型：
--
作者：
Hashimoto, Y.;Murakami, Y.;Kono, J.
我们已经进行了偏振相关的超快泵浦-探测光谱的膜对齐的单壁碳纳米管束。考虑到不完美的纳米管排列，以及各向异性吸收截面，我们定量确定了明显不同的光漂白动力学的偏振平行和垂直于管轴。对于垂直极化，我们观察到一个缓慢的（1.0-1.5 ps）松弛过程，以前没有观察到在随机取向的纳米管束。我们将这种较慢的动力学归因于纳米管束径向方向上的表面等离子体激元的激发和弛豫。
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.