DMREF: Collaborative Research: Nanoscale Temperature Manipulation via Plasmonic Fano Interferences

DMREF：协作研究：通过等离子体 Fano 干扰进行纳米级温度操纵

• 批准号: 1728340
• 负责人: Katherine Willets
• 金额: $ 44.01万
• 依托单位: Temple University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-08-15 至 2022-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1728340&HistoricalAwards=false
• 关键词: DMREF; Collaborative; Research; Nanoscale; Temperature; DMREF; Collaborative; Research; Nanoscale; Temperature

Thermal energy, also known as heat, flows naturally from hot objects to cold objects. One consequence of this heat flow is that it is difficult to create objects with localized "hot spots," even when heat is applied to a single spot. When touching a hot pan on the stove, the temperature of the lid on top of the pan is not much different than the bottom where the heat is applied. Depositing and maintaining thermal energy in a small region of space becomes even more challenging as the object's size approaches the tens to hundreds of nanometers, or about 1,000 times smaller than a human hair. Yet, the ability to control heat flow and thus temperature at nanoscopic dimensions has important implications for applications ranging from data storage and the local control of chemical reactions to photothermal therapies for disease treatment and pain management through ion channel stimulation. With support from the Designing Materials to Revolutionize and Engineer our Future (DMREF) Program in the Division of Chemistry (CHE) and the Division of Chemical, Bioengineering, Environmental, and Transport Systems (CBET), Professor David J. Masiello from the University of Washington, Professor Katherine A. Willets from Temple University, and Professor Stephan Link from Rice University are developing methods to theoretically design and experimentally realize a new class of materials capable of controllably directing temperature increases to nanoscale regions of space. Beyond impacting a wide variety of applications, the project is also facilitating the interdisciplinary training of students and postdoctoral researchers through student exchange between the three research groups. Together, the researchers and their students are designing plasmonic nanostructures that exploit Fano interferences to focus and convert optical radiation into precise nanoscopic temperature profiles that are actively tunable from the far-field. They are developing computer simulations to solve the coupled Maxwell-heat diffusion equations and using them to design novel plasmonic nanostructures with Fano interferences that are capable of localizing spatial temperature profiles at dimensions below the diffraction limit. The best candidates are then created in the laboratory and characterized using optical microscopies. Diffraction-limited, single-nanoparticle photothermal absorption spectroscopy techniques measure the heat power absorbed as well as the associated temperature change induced in the target material. Fluorescently-labeled stem-loop DNA structures are used to achieve super-resolution imaging of the nanoscopic temperature profile. The imaging results are then input into the design of the next generation of structures, providing the iterative feedback that is critical to the project's success.

热能（也称为热能）自然地从热物体流向冷物体。这种热流的结果之一是，即使将热量施加到单个位置时，也很难创建具有局部“热点”的物体。 当触摸炉子上的热锅时，锅顶的盖子温度与施加热量的底部没有太大不同。 随着物体的大小接近数十个纳米，或比人毛小的1000倍，在较小的空间区域中沉积和维持热能变得更具挑战性。 然而，控制热流的能力以及纳米镜下的温度的能力对从数据存储和化学反应的局部控制到光热治疗的应用具有重要意义，以通过离子通道刺激进行疾病治疗和疼痛管理。 With support from the Designing Materials to Revolutionize and Engineer our Future (DMREF) Program in the Division of Chemistry (CHE) and the Division of Chemical, Bioengineering, Environmental, and Transport Systems (CBET), Professor David J. Masiello from the University of Washington, Professor Katherine A. Willets from Temple University, and Professor Stephan Link from Rice University are developing methods to theoretically design and experimentally realize a new class of materials capable of controllably directing温度升高到空间的纳米级区域。 除了影响各种应用程序外，该项目还通过三个研究小组之间的学生交流来促进学生和博士后研究人员的跨学科培训。研究人员及其学生共同设计了等离激元纳米结构，这些等离子纳米结构利用FANO干扰将光辐射聚焦并转换为精确的纳米镜头温度曲线，这些温度谱是从远场主动调节的。 他们正在开发计算机模拟，以求解麦克斯韦热扩散方程的耦合，并使用它们来设计具有FANO干扰的新型等离子体纳米结构，这些纳米结构能够将空间温度轮廓定位在低于衍射极限的尺寸上。然后在实验室中创建最好的候选者，并使用光学显微镜进行表征。衍射受限的单纳米颗粒光热吸收光谱技术测量吸收的热力以及目标材料中引起的相关温度变化。 荧光标记的茎环DNA结构用于实现纳米温度曲线的超分辨率成像。然后将成像结果输入到下一代结构的设计中，从而提供对项目成功至关重要的迭代反馈。