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首页> 外文期刊>Physica status solidi, B. Basic research >Effect of environment on ultrafast photoexcitation kinetics in single-wall carbon nanotubes
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Effect of environment on ultrafast photoexcitation kinetics in single-wall carbon nanotubes

机译：环境对单壁碳纳米管中超快光激发动力学的影响

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Recently, nonlinear optical properties of single-wall carbon nanotubes (SWNT) have attracted a great interest. This material has been proven to be an efficient wide spectral range saturable absorber. However, up to now it is unclear what are the optimum sample preparation parameters and operational spectral range. In this work, we have applied femtosecond pump–probe spectroscopy to investigate photoexcitation kinetics in SWNTs depending on the sample preparation technique.Wedemonstrate here that the characteristic lifetimes of the saturable absorption in SWNT samples decrease with increasing interaction of SWNTs with each other and with the surrounding environment. We also show that the saturable absorption is fairly strong not only for the energies corresponding to the first electronic transition, but also for transitions at higher energies. We conjecture the contribution of energy and charge transfer to the observed ultrafast dynamics. Charge transfer is evidenced by a photo-induced enhancement of the Sommerfeld factor.
机译：近来，单壁碳纳米管（SWNT）的非线性光学性质引起了极大的兴趣。该材料已被证明是一种有效的宽光谱范围的可饱和吸收剂。但是，到目前为止，尚不清楚最佳的样品制备参数和操作光谱范围是多少。在这项工作中，我们应用飞秒泵浦-探针光谱法研究了根据样品制备技术在单壁碳纳米管中的光激发动力学。在此证明，单壁碳纳米管样品中饱和吸收的特征寿命随着单壁碳纳米管彼此之间以及与单壁碳纳米管之间相互作用的增加而降低。周围的环境。我们还表明，不仅对于与第一电子跃迁相对应的能量，而且对于较高能量的跃迁，可饱和吸收都相当强。我们推测能量和电荷转移对观察到的超快动力学的贡献。通过光诱导的Sommerfeld因子增强可以证明电荷转移。

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