Proposal to resurrect femtosecond laser labs for probing electronic materials

复兴飞秒激光实验室以探测电子材料的提案

• 批准号: RTI-2023-00018
• 负责人: Kambhampati, Patanjali
• 金额: $ 10.53万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=747937
• 关键词: Proposal; resurrect; femtosecond; laser; labs

The requested instruments form an enabling role in our comprehensive integrated system for investigating charge carrier dynamics in optoelectronic materials. The Kambhampati group are world experts at femtosecond laser spectroscopy. The objective of femtosecond laser spectroscopy is to resolve in time the primary dynamical events in some chemical or physical process. In our group we focus on charge carrier dynamics in semiconductor nanostructures such as semiconductor quantum dots and semiconductor perovskites. Both materials are central to the emergence of materials for our energy future. Both materials have an electronic response in which the materials are favorable for both light absorptive applications like photovoltaics and light emissive applications like LEDs. Hence one aims to perform femtosecond laser spectroscopy in the electronic regime to be able to probe carrier dynamics. In our group we have a suite of three world class ultrafast spectrometers distributed between two femtosecond laser labs. In our first lab commissioned in 2005 we have a home-built pump/probe spectrometer. And in our second lab commissioned in 2015 we have a home-built two-dimensional electronic spectrometer (2DE) and a time-resolved photoluminescence (t-PL) spectrometer. Each of our three instruments represents the state-of-the-art in femtosecond spectroscopy in the electronic regime. But the instrumentation is aging and needs new components and sub-systems to bring the spectrometers back to operational readiness. The spectrometer in Lab1 is nearly nonfunctional as the majority of the components are damaged due to aging and use. The spectrometer in Lab2 is functional but needs a few key improvements to keep it functioning research ready at the state-of-the-art. These integrated systems uniquely enable our research and training to proceed.      Without the requested tools our entire research program that is funded by NSERC, FQRNT, and Sony is decimated. 50% of our output comes from the pump/probe spectrometer in Lab1 which is totally dead. 25% of our output comes from the 2DE spectroscopy instrument in Lab2 and the t-PL instrument in Lab2. Right now only the t-PL instrument is working as intended. The 2DE instrument requires a new hollow core fiber light source, and a number of additional components to be research ready again. The pump/probe instrument has been down for a year now due to poorly functioning pump lasers. More importantly we have many optics and sub-systems that are malfunctioning whether electronically or optically.      With the requested funding, we will be able to continue to do our main line of research into producing breakthrough results on the dynamics of charges in materials for energy applications. These tools will enable our training of up to 10 HQP at the PHD level per year. The HQP will be trained at the highest levels of academic science, but also connection to industries.

所要求的仪器在我们研究光电材料中的载流子动力学的综合集成系统中起着使能作用。Kambhampati小组是飞秒激光光谱学的世界专家。飞秒激光光谱学的目的是及时分辨化学或物理过程中的主要动力学事件。本课题组主要研究半导体纳米结构中的载流子动力学，如半导体量子点和半导体钙钛矿。这两种材料都是未来能源材料出现的核心。这两种材料都有电子响应，这两种材料都有利于光吸收应用，如光伏发电和光发射应用，如led。因此，人们的目标是在电子系统中执行飞秒激光光谱，以便能够探测载流子动力学。在我们的团队中，我们有三个世界一流的超快光谱仪，分布在两个飞秒激光实验室之间。在我们2005年投入使用的第一个实验室中，我们有一个自制的泵/探针光谱仪。在我们2015年投入使用的第二个实验室中，我们有一台自制的二维电子光谱仪（2DE）和一台时间分辨光致发光光谱仪（t-PL）。我们的三个仪器中的每一个都代表了电子体制中飞秒光谱的最先进技术。但是仪器正在老化，需要新的组件和子系统来使光谱仪恢复到可操作状态。Lab1中的光谱仪几乎没有功能，因为大多数组件由于老化和使用而损坏。2号实验室的光谱仪是可以工作的，但需要一些关键的改进来保持它的功能，为最先进的研究做好准备。这些综合系统使我们的研究和培训得以进行。如果没有所需的工具，我们由NSERC、FQRNT和索尼资助的整个研究项目就会被摧毁。我们50%的输出来自Lab1的泵/探针光谱仪，它完全没有电。实验室2的2DE光谱仪和实验室2的t-PL仪占我们产量的25%。目前只有t-PL仪器按预期工作。2DE仪器需要一个新的空心芯光纤光源，以及一些额外的组件，以备再次研究。由于泵浦激光器功能不佳，泵浦/探针仪器已经停机一年了。更重要的是，我们有许多光学和子系统出现故障，无论是电子的还是光学的。有了申请的资金，我们将能够继续进行我们的主要研究，在能源应用材料的电荷动力学方面取得突破性成果。这些工具将使我们每年培训多达10名HQP博士。HQP将在学术科学的最高水平上进行培训，但也与工业联系。