Time-resolved photoelectron spectroscopy of hot carrier decay in gold plasmonic nanostructures

金等离子体纳米结构中热载流子衰变的时间分辨光电子能谱

• 批准号: 2320485
• 金额: --
• 依托单位: King's College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2320485
• 关键词: Time; resolved; photoelectron; spectroscopy; hot

The project will involve the application of femtosecond time-resolved photoemission spectroscopy (TRPES) as a probe of plasmon-enhanced hot carrier generation and decay in plasmonic nanomaterials, both in ultrahigh vacuum (surfaces) and in aqueous solution. These hot carriers undergo energy loss, which can be via energy transfer to adjacent molecules or materials.The TRPES spectroscopy measurements will involve the use of femtosecond lasers, an ultrahigh vacuum surface science apparatus with a hemispherical electron energy analyser and a liquid-microjet apparatus with a magnetic-bottle time-of-flight electron analyser. A number of different plasmonic architectures will be considered, including colloidal nanoparticles and metamaterials based on arrays of electro- chemically grown gold nanorods, and characterised using optical extinction spectroscopy coupled with numerical modelling of electromagnetic field simulations. Nanomaterials will be fabricated with properties tuned to explore the dependence of photoelectron emission on resonant excitation of surface plasmons, and on nanostructure geometry.

该项目将涉及应用飞秒时间分辨光电子能谱（TRPES）作为等离子体纳米材料中等离子体增强热载流子的产生和衰变的探针，无论是在超高真空（表面）还是在水溶液中。这些热载流子会经历能量损失，这可能是通过能量转移到相邻的分子或材料来实现的。TRPES 光谱测量将涉及使用飞秒激光器、带有半球电子能量分析仪的超高真空表面科学设备和带有半球形电子能量分析仪的液体微射流设备。磁瓶飞行时间电子分析仪。将考虑许多不同的等离子体结构，包括基于电化学生长的金纳米棒阵列的胶体纳米颗粒和超材料，并使用消光光谱与电磁场模拟的数值模型相结合进行表征。将制造具有调整特性的纳米材料，以探索光电子发射对表面等离子体共振激发和纳米结构几何形状的依赖性。