Minutella Emanuele, Schulz Florian, Lange Holger
Institute for Physical Chemistry, University of Hamburg , Martin-Luther-King Platz 6, 20146 Hamburg, Germany.
The Hamburg Centre For Ultrafast Imaging, CUI, Luruper Chaussee 149, 22761 Hamburg, Germany.
J Phys Chem Lett. 2017 Oct 5;8(19):4925-4929. doi: 10.1021/acs.jpclett.7b02043. Epub 2017 Sep 27.
The decay of a plasmon leads to a hot electron distribution in metallic nanoparticles. Depending on the processes involved in the excitation, different distributions are obtained, which thermalize differently. We experimentally investigate excitation-wavelength and size-dependences on the generation and thermalization of the hot-electrons. We can confirm the absence of size-dependences, and we clearly observe two regimes with significantly different relaxation dynamics depending on the photon energy. The hot electron generation is more efficient when exciting with light that enables interband transitions.
等离激元的衰变会导致金属纳米颗粒中产生热电子分布。根据激发过程的不同，会得到不同的分布，其热化方式也不同。我们通过实验研究了激发波长和尺寸对热电子产生及热化的影响。我们能够确认不存在尺寸依赖性，并且清楚地观察到根据光子能量存在两种具有显著不同弛豫动力学的状态。当用能实现带间跃迁的光进行激发时，热电子的产生效率更高。
