Development of Optical Excitation Scanning Probe Microscopes With Atomic Resolution

具有原子分辨率的光学激发扫描探针显微镜的开发

• 批准号: 0216083
• 负责人: Paul Weiss
• 金额: $ 54万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-01 至 2006-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0216083&HistoricalAwards=false
• 关键词: Development; Optical; Excitation; Scanning; Probe

This award from the Major Research Instrumentation program supports scientists at Penn State University to develop new atomic resolution scanning probe optical spectroscopies by combining the spatial resolution of the scanning tunneling microscope (STM) with well-established, readily interpreted near ultraviolet, visible and infrared spectroscopies. A vital missing piece in the vast majority of scanning probe measurements is the ability to make unambiguous interpretations of images and chemical assignments of adsorbates. The researchers focus on adding spectroscopies that are already well established for ensemble-averaged measurements that can accomplish these assignments, specifically ultraviolet-visible (UV-Vis) and infrared (IR) spectroscopies. By coupling IR and optical spectroscopies with a local probe, the researchers will gain the ability to characterize and to identify individual nanostructures and even individual molecules and atoms based on their optical and electronic properties. This work will advance the state of the art in nanometer-scale science, measurement, and analysis. Optical spectroscopies provide well-understood methods to determine chemical identity and bonding changes and to determine electronic structure using IR and UV-Vis excitation, respectively. These capabilities will be combined to create a local optical spectrometer in the near UV, visible and IR, with wide applications in surface and interface science. Evanescent coupling will be utilized to deliver photons to the tunneling junction, using the STM tip as a detector. The surfaces studied will be well characterized, as they will be grown epitaxially on a variety of prisms. These experiments will complement the recently built dispersed photon emission STM built under the auspices of an instrument development grant from the NSF Divisions of Materials Research and Chemistry. These instruments will then be transitioned to the broader scientific community after development and optimization. Two talented graduate students and an undergraduate will participate in the fabrication of the new instruments.This award from the Major Research Instrumentation program supports scientists at Penn State University to develop new atomic resolution scanning probe optical spectroscopies by combining the spatial resolution of the scanning tunneling microscope (STM) with well-established, readily interpreted near ultraviolet, visible and infrared spectroscopies. A vital missing piece in the vast majority of scanning probe measurements is the ability to make unambiguous interpretations of images and chemical assignments of adsorbates. The researchers focus on adding spectroscopies that are already well established for ensemble-averaged measurements that can accomplish these assignments, specifically ultraviolet-visible (UV-Vis) and infrared (IR) spectroscopies. By coupling IR and optical spectroscopies with a local probe, the researchers will gain the ability to characterize and to identify individual nanostructures and even individual molecules and atoms based on their optical and electronic properties. This work will advance the state of the art in nanometer-scale science, measurement, and analysis. These instruments will then be transitioned to the broader scientific community after development and optimization. Two talented graduate students and an undergraduate will participate in the fabrication of the new instruments.

该奖项来自重大研究仪器计划，支持宾夕法尼亚州立大学的科学家通过将扫描隧道显微镜（STM）的空间分辨率与成熟的、易于解释的近紫外、可见和红外光谱相结合，开发新的原子分辨率扫描探针光谱。 在绝大多数扫描探针测量中，一个重要的缺失部分是对图像和吸附物化学分配进行明确解释的能力。研究人员专注于添加已经为整体平均测量建立的光谱，可以完成这些任务，特别是紫外可见（UV-Vis）和红外（IR）光谱。通过将红外光谱和光学光谱与本地探针相结合，研究人员将能够根据其光学和电子特性来表征和识别单个纳米结构，甚至单个分子和原子。这项工作将推进纳米尺度科学、测量和分析的最新发展。光谱学提供了很好理解的方法来确定化学特性和键合变化，并分别使用IR和UV-Vis激发来确定电子结构。这些能力将结合起来，创造一个本地的光学光谱仪在近紫外线，可见光和红外线，在表面和界面科学的广泛应用。将利用倏逝波耦合将光子传递到隧道结，使用STM尖端作为检测器。研究的表面将得到很好的表征，因为它们将在各种棱镜上外延生长。这些实验将补充最近建造的分散光子发射STM，该STM是在NSF材料研究和化学部门的仪器开发资助下建造的。这些仪器将在开发和优化后向更广泛的科学界过渡。两名才华横溢的研究生和一名本科生将参与新仪器的制造。这项来自重大研究仪器计划的奖项支持宾夕法尼亚州立大学的科学家通过将扫描隧道显微镜（STM）的空间分辨率与成熟的、易于解释的近紫外、可见和红外光谱相结合，开发新的原子分辨率扫描探针光谱。 在绝大多数扫描探针测量中，一个重要的缺失部分是对图像和吸附物化学分配进行明确解释的能力。研究人员专注于添加已经为整体平均测量建立的光谱，可以完成这些任务，特别是紫外可见（UV-Vis）和红外（IR）光谱。通过将红外光谱和光学光谱与本地探针相结合，研究人员将能够根据其光学和电子特性来表征和识别单个纳米结构，甚至单个分子和原子。这项工作将推进纳米尺度科学、测量和分析的最新发展。这些仪器将在开发和优化后向更广泛的科学界过渡。两名才华横溢的研究生和一名本科生将参与新仪器的制造。