CAREER: Structure-specific Nanoscale Dynamics Studied by Nonlinear and Magneto-optical Spectroscopy

这项由大分子、超分子和纳米化学（MSN）项目颁发的CAREER奖支持佛罗里达州立大学Kenneth Knappenberger教授的工作，该研究旨在开发先进的光谱技术，用于研究金纳米结构的尺寸依赖和结构特异性光学特性，范围从量子限制团簇（2nm）到等离子体支持粒子（2nm）。具体来说，PI将与研究生一起开发飞秒时间分辨磁光技术，以研究尺寸选择金纳米团簇的电子结构和激发态动力学。PI还将开发一个能够进行单粒子测量的非线性显微镜平台。这些数据将为小聚集体和光刻形成的阵列中的金纳米结构的杂化所产生的等离子体模式提供信息。在这两个领域取得的进展将被合并来描述等离子体介导的电偶极子跃迁，非线性成像设施将扩展到能够进行状态分辨等离子体增强测量的磁光平台。该奖项将允许Knappenberger教授开发先进的测量技术，以系统地研究纳米颗粒结构-功能相互作用。这项研究将影响几个技术领域：太阳能转换、国家安全、痕量分析和高对比度生物医学成像。此外，还将建立能够提供时间和空间分辨磁光数据的新设施。因此，该小组将建立一个独特的专业知识，可以应用于许多需要自旋和氧化态信息的科学和技术领域的问题。该项目将在佛罗里达州立大学的跨学科环境中教育本科生和研究生，并将受益于与国家强磁场实验室的密切互动。此外，为了提高不同高中学生对科学技术的理解和兴趣，Knappenberger教授将与一名高中教师密切合作，在基于图像的化学课程中引入新的仪器。最后，作为研究者课堂教学的延伸，将开发一系列教学视觉材料，向不同的受众描述科学仪器的正确使用。

This CAREER award by the Macromolecular, Supramolecular, and Nanochemistry (MSN) program supports work by Professor Kenneth Knappenberger at Florida State University -endowed to develop advanced spectroscopic techniques for the investigation of the size-dependent and structure-specific optical properties of gold nanostructures ranging from quantum-confined clusters ( 2 nm) to plasmon-supporting particles ( 2 nm). Specifically, the PI, along with graduate students, will develop femtosecond time-resolved magneto-optical techniques to study both the electronic structure and excited state-dynamics of size-selected gold nanoclusters. The PI will also develop a nonlinear microscopy platform capable of single-particle measurements. These data will inform on plasmon modes that result from hybridization of gold nanostructures in both small aggregates and lithographically formed arrays. Advances made in these two areas will be merged to describe plasmon-mediated electric-dipole transitions, and the nonlinear imaging facility will be extended to a magneto-optical platform capable of state-resolved plasmon-enhancement measurements. The award will allow Professor Knappenberger to develop advanced measurement technologies to investigate systematically the nanoparticle structure-function interplay. This research will impact several technical areas: solar-energy conversion, national security, trace-level analysis and high-contrast biomedical imaging. Moreover, new facilities, capable of providing temporally and spatially resolved magneto-optical data, will be established. As a result, the group will establish a unique expertise that can be applied to problems in many areas of science and technology that require spin and oxidation state information. This program will educate both undergraduate and graduate students in an interdisciplinary environment at Florida State University and will benefit from close interactions with the National High Magnetic Field Laboratory. Also, in an effort to improve understanding and stimulate interest in science and technology among a diverse group of high school students, Professor Knappenberger will work closely with a high school teacher to introduce new instrumentation into an image-based chemistry curriculum. Finally, as an extension of the investigator's classroom teaching, a series of instructional visual materials will be developed to describe proper use of scientific instruments to a diverse audience.