Model-Based Ultrafast High Resolution Nano-Interrogation

基于模型的超快高分辨率纳米询问

• 批准号: 0814612
• 负责人: Murti Salapaka
• 金额: $ 19.17万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-01 至 2009-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0814612&HistoricalAwards=false
• 关键词: Model; Based; Ultrafast; Resolution; Nano

Nanotechnology has the potential to revolutionize the human condition through fundamental contributionsto science and technology. The chances of realizing the full potential of nanotechnology have been buttressedby recent demonstrations of rational control and manipulation of matter at the atomic level. Yet, in spite ofthe remarkable feats achieved in its nascent years, nanotechnology has formidable challenges to overcome inthe areas of manufacturing methods, system design, and basic understanding. These challenges have to beovercome before the promise of this new paradigm becomes a reality.The goal of this proposal is to establish a paradigm for real-time use of models in Atomic Force Microscopy(AFM). The concept of using models in real-time has significant potential that has not received the deservedattention by atomic force microscopists as the related tools are primarily employed by engineers. Such aperspective facilitates interpretation of data since it provides a precise means of delineating the effects ofthe inherent dynamics of the system from the properties of the sample being probed. Thus it provides aneffective means of interpreting sample properties. In addition to the proposal goal of laying the foundationsof a new paradigm, specific aims of the proposal will result in a new ultrafast investigation tool for AFM,termed the Transient Force Detector (TFD). The prototype will yield hundred thousand features per seconddetection rates without compromising sample size and resolution. A particular advantage of the TFD is thatthe resolution of the detection process, dependent on the quality factor of the cantilever probe, is decoupledfrom the speed of the detection process. Issues of the loss of the probe signal and high resolution imagingbased on the likelihood that the probe is detecting the sample will be addressed. Use of models in realtimeis very well suited to explore model based imaging where a more detailed information is desired whencompared to detection. A finer characterization of the sample will result only if cantilever-sample interactionmodels amenable for real-time use are available. Based on averaging theory, a methodology is proposed toextract sample characteristics that include topography, local stiffness and local damping at the nanoscale.This includes a parallel operation where the sample characteristics will be gleaned by real-time models builton the results of the averaging analysis of the tip-sample dynamics. Observer theory based active modificationof the cantilever probe is presented. This systems viewpoint opens up new vistas for tailoring bandwidth,resolution and forces on the tip and sample. This enhanced flexibility is absent from the present set of toolson modifying the cantilever dynamics. The innovative methods to be developed in the proposed investigationwill be complemented by the existing and future experimental facilities. Preliminary proof of concept resultsindicate the vast potential of the model based imaging paradigm presented.Broader Impacts: Micro-cantilevers are being used in diverse areas with increasing impact and has in-fluenced science in a fundamental manner. The methods proposed are enabling technologies and will opendoors for investigating basic science issues by providing ultra-high bandwidth and resolution. The innovativecontributions of the proposals will directly impact most aspects of scanning probe microscopy, as the proposedmethods apply to most of the existing setups. For example, it will directly impact the extremely highdensity data storage (3 Tb/in2) and read out technologies as well as the array technologies employed by thebio industry. The experimental aspects of the proposed research will be accomplished in collaboration withAsylum Research, and Bioforce Nanosciences Inc. both leading biology related scanning probe microscope(SPM) company. This collaboration is expected to foster transfer of the theory and technology developedin this program between the academic institution of the PI and the SPM industry. The PI has successfullydisseminated the system and control theory viewpoints to the physics community that is heavily involved inscanning probe microscopy. Under this proposal goals the PI will continue to push the synergistic transfer ofknowhow between the two communities by exchanging student visits and presenting specialized workshops.A web based remote operation of SPMs is being explored by the PI in collaboration with Asylum Researchthat can be used for remote operation that will aid this effort.

纳米技术有可能通过对科学和技术的根本性贡献来彻底改变人类的状况。最近在原子水平上对物质进行合理控制和操纵的示范，使实现纳米技术全部潜力的机会得到了加强。然而，尽管纳米技术在其诞生之初就取得了非凡的成就，但在制造方法、系统设计和基本理解等领域仍面临着巨大的挑战。这些挑战必须被克服之前的承诺，这种新的范例成为现实。本建议的目标是建立一个范例，实时使用模型的原子力显微镜（AFM）。实时使用模型的概念具有巨大的潜力，但尚未得到原子力显微镜学家应有的关注，因为相关工具主要由工程师使用。这样的前瞻性有利于数据的解释，因为它提供了一种精确的手段，从被探测样品的性质中描绘出系统固有动力学的影响。因此，它提供了一种解释样品性质的有效手段。除了为新范式奠定基础的提案目标外，该提案的具体目标还将为AFM带来一种新的超快调查工具，称为瞬态力检测器（TFD）。该原型将产生每秒数十万个特征的检测率，而不会影响样本大小和分辨率。TFD的一个特别的优点是检测过程的分辨率取决于悬臂梁探针的品质因数，与检测过程的速度无关。探头信号丢失和基于探头检测样本的可能性的高分辨率成像的问题将得到解决。使用实时模型非常适合于探索基于模型的成像，其中与检测相比，需要更详细的信息。只有当可实时使用的样品-样品相互作用模型可用时，才能对样品进行更精细的表征。基于平均理论，提出了一种方法来提取样品特征，包括形貌，局部刚度和局部阻尼在nanoscale.这包括一个并行操作，其中样品特征将收集的实时模型建立在平均分析的结果的尖端样品动力学。提出了一种基于观测器理论的悬臂梁测头主动修正方法。这一系统视角为定制带宽、分辨率以及针尖和样品上的力开辟了新的前景。这种增强的灵活性是缺乏从目前的一套工具修改悬臂动力学。在拟议的调查中开发的创新方法将得到现有和未来实验设施的补充。初步证明的概念resultsindicate的巨大潜力的模型为基础的成像paradigm presented.Broader影响：微杠杆正在使用在不同的领域，越来越多的影响，并影响科学的根本方式。所提出的方法是使能技术，并将通过提供超高带宽和分辨率为研究基础科学问题打开大门。这些建议的创新贡献将直接影响扫描探针显微镜的大多数方面，因为所提出的方法适用于大多数现有的设置。例如，它将直接影响极高密度数据存储（3 Tb/in 2）和读出技术以及生物工业所采用的阵列技术。拟议研究的实验方面将与庇护研究和生物力纳米科学公司合作完成。都是领先的生物相关扫描探针显微镜（SPM）公司。这种合作有望促进PI学术机构和SPM行业之间的理论和技术转移。PI已经成功地将系统和控制理论的观点传播到了物理学界，这些观点在扫描探针显微镜中有很大的影响。根据这一建议目标，PI将继续推动两个社区之间的知识协同转移，通过交换学生访问和举办专业研讨会。PI正在与庇护研究合作，探索一种基于网络的SPM远程操作，可用于远程操作，这将有助于这一努力。