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Macro-scale transport of the excitation energy along a metal nanotrack: exciton-plasmon energy transfer mechanism.
Scientific Reports ( IF 3.8 ) Pub Date : 2019-Jan-14 , DOI: 10.1038/s41598-018-36627-2 Igor Khmelinskii 1 , Serguei N Skatchkov 2 , Vladimir I Makarov 3
Scientific Reports ( IF 3.8 ) Pub Date : 2019-Jan-14 , DOI: 10.1038/s41598-018-36627-2 Igor Khmelinskii 1 , Serguei N Skatchkov 2 , Vladimir I Makarov 3
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Presently we report (i) excited state (exciton) propagation in a metal nanotrack over macroscopic distances, along with (ii) energy transfer from the nanotrack to adsorbed dye molecules. We measured the rates of both of these processes. We concluded that the effective speed of exciton propagation along the nanotrack is about 8 × 107 cm/s, much lower than the surface plasmon propagation speed of 1.4 × 1010 cm/s. We report that the transmitted energy yield depends on the nanotrack length, with the energy emitted from the surface much lower than the transmitted energy, i.e. the excited nanotrack mainly emits in its end zone. Our model thus assumes that the limiting step in the exciton propagation is the energy transfer between the originally prepared excitons and surface plasmons, with the rate constant of about 5.7 × 107 s-1. We also conclude that the energy transfer between the nanotrack and the adsorbed dye is limited by the excited-state lifetime in the nanotrack. Indeed, the measured characteristic buildup time of the dye emission is much longer than the characteristic energy transfer time to the dye of 81 ns, and thus must be determined by the excited state lifetime in the nanotrack. Indeed, the latter is very close to the characteristic buildup time of the dye emission. The data obtained are novel and very promising for a broad range of future applications.
中文翻译：
沿着金属纳米轨道的激发能量的宏观传输：激子-等离子体能量转移机制。
目前，我们报告了（i）金属纳米轨道中宏观距离的激发态（激子）传播，以及（ii）从纳米轨道到吸附的染料分子的能量转移。我们测量了这两个过程的速率。我们得出的结论是，激子沿纳米轨道传播的有效速度约为8 × 10 7 cm/s，远低于表面等离子体传播速度1.4 × 10 10 cm/s。我们报道，传输的能量产率取决于纳米轨道的长度，从表面发射的能量远低于传输的能量，即激发的纳米轨道主要在其端部区域发射。因此，我们的模型假设激子传播的限制步骤是最初制备的激子和表面等离子体激元之间的能量转移，速率常数约为 5.7 × 10 7 s -1 。我们还得出结论，纳米轨道和吸附染料之间的能量转移受到纳米轨道中激发态寿命的限制。事实上，测得的染料发射特征建立时间比 81 ns 的染料特征能量转移时间长得多，因此必须由纳米轨道中的激发态寿命来确定。事实上，后者非常接近染料发射的特征建立时间。获得的数据是新颖的，并且对于未来的广泛应用非常有前景。
更新日期：2019-01-14
中文翻译：
沿着金属纳米轨道的激发能量的宏观传输：激子-等离子体能量转移机制。
目前，我们报告了（i）金属纳米轨道中宏观距离的激发态（激子）传播，以及（ii）从纳米轨道到吸附的染料分子的能量转移。我们测量了这两个过程的速率。我们得出的结论是，激子沿纳米轨道传播的有效速度约为8 × 10 7 cm/s，远低于表面等离子体传播速度1.4 × 10 10 cm/s。我们报道，传输的能量产率取决于纳米轨道的长度，从表面发射的能量远低于传输的能量，即激发的纳米轨道主要在其端部区域发射。因此，我们的模型假设激子传播的限制步骤是最初制备的激子和表面等离子体激元之间的能量转移，速率常数约为 5.7 × 10 7 s -1 。我们还得出结论，纳米轨道和吸附染料之间的能量转移受到纳米轨道中激发态寿命的限制。事实上，测得的染料发射特征建立时间比 81 ns 的染料特征能量转移时间长得多，因此必须由纳米轨道中的激发态寿命来确定。事实上，后者非常接近染料发射的特征建立时间。获得的数据是新颖的，并且对于未来的广泛应用非常有前景。
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