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.

该项目将涉及在超高真空（表面）和水溶液中的等离激元纳米材料中的等离子纳米材料中的等离子纳米材料中的等离子增强热载体产生和衰减的探针。这些热载体会通过能量转移到相邻分子或材料中经历能量损失。TRPES光谱测量将涉及使用飞秒激光器，这是一种超高真空表面科学设备，具有半球能量分析仪和液体米卡特式设备，并具有磁性瓶装仪，具有磁性瓶装仪。将考虑许多不同的等离激元结构，包括基于电化化学生长的金纳米棒阵列的胶体纳米颗粒和超材料，并使用光学灭绝光谱谱以及电磁场模拟的数值模型进行了表征。纳米材料将使用调节的特性制造，以探索光电发射对表面等离子体的共振激发和纳米结构几何形状的依赖性。