Nonlinear and ultrafast optical response in single-walled carbon nanotubes
Nonlinear and ultrafast optical response in single-walled carbon nanotubes
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DOI：
10.1088/1742-6596/21/1/029
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
A. Maeda;S. Matsumoto;H. Kishida;T. Takenobu;Y. Iwasa;M. Shiraishi;M. Ata;H. Okamoto
中科院分区：
文献类型：
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作者：
A. Maeda;S. Matsumoto;H. Kishida;T. Takenobu;Y. Iwasa;M. Shiraishi;M. Ata;H. Okamoto
用Z扫描方法测量了半导体单壁碳纳米管（SWNTs）的三阶非线性极化率（χ（3））谱。|Im χ（3）|在共振激发下，能显著增强到最低的带间跃迁，达到4.2 × 10− 6esu。通过简并和非简并泵浦探测测量评估的瞬态吸收变化的比较表明，|Im χ（3）|由相干过程而不是由非相干过程如吸收饱和控制。
We measured third-order nonlinear susceptibility (χ(3)) spectra in semiconducting single-walled carbon nanotubes (SWNTs) by the Z-scan method. |Im χ(3)| is remarkably enhanced under resonant excitation to the lowest interband transition, reaching 4.2 × 10−6 esu. A comparison of the transient absorption changes evaluated by degenerate and nondegenerate pump-probe measurements suggests that the resonant enhancement of |Im χ(3)| is dominated by a coherent process rather than by incoherent one such as saturation of absorption.