Sensors: High Bandwidth and Minimally Invasive Micro-Cantilever Sensing Based on Transient Dynamics and Thermal Noise Effects

传感器：基于瞬态动力学和热噪声效应的高带宽和微创微悬臂梁传感

• 批准号: 0330224
• 负责人: Murti Salapaka
• 金额: $ 29.97万
• 依托单位: Iowa State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-09-01 至 2007-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0330224&HistoricalAwards=false
• 关键词: Sensors; Bandwidth; Minimally; Invasive; Micro

One of the most promising technologies that has evolved in the last decade that provides atomic precision is based on the micro-cantilever. Indeed, these devices were amongst the first to demonstrate the feasibility of nanotechnology. Micro-cantilever based devices have revolutionized interrogation control and manipulation of matter at the nanoscale. However, the vast potential of such devices is far from being harnessed.In this proposal we will develop an innovative scheme where the micro-cantilever transient is effectively employed to obtain microsecond time scales for sample investigation. This new method called transient signal imaging will be several orders of magnitude faster with all the desirable features of the present dynamic mode. This will provide the first micro cantilever method of investigation of dynamics at the nanoscale with microsecond temporal resolution. In many proposed applications of the micro-cantilever based sensing, like single electron spin detection where the aim is to detect a single electron spin at room temperature, it is imperative that the sensing does not disturb the phenomenon being observed. Another key feature of such studies is that the forces are often localized and could evolve over relatively large time scales. An innovative aspect of the proposal is a thermal noise based scheme that leads to a minimally invasive way of interrogation over relatively large time scales. The high sensitivity will be achieved by maintaining Angstrom scale tip-sample distances and by controlling the cantilever tip to be in the gentler attractive regime of the tip-sample interaction potential. This is achieved by estimating the equivalent frequency of the microcantilever from its thermal noise.To aid the innovative methods to be developed in the proposed investigation we present acomprehensive experimental setup which can be utilized to obtain multi-mode models of the micro-cantilever. Such an instrument is crucial to the development of the transient signal imaging and will be used to validate and suggest future strategies.The broader impacts of this proposal are significant. Micro-cantilevers are being used in diverse areas with increasing impact and have influenced science in a fundamental manner. The two methods are enabling technologies and will open doors for investigating basic science issues by providing ultra-high bandwidth and resolution. The innovative contributions of the proposals will directly impact most aspects of scanning probe microscopy, as the proposed methods apply to most of the existing setups. The experimental aspects of the proposed research will be accomplished in collaboration with Asylum Research a leading biology related scanning probe microscope (SPM) company. This collaboration is expected to foster transfer of the theory and technology developed in this program between the academic institution of the PI and the SPM industry.

在过去的十年中发展起来的最有前途的技术之一，提供原子精度是基于微悬臂梁。事实上，这些设备是最早证明纳米技术可行性的设备之一。基于微悬臂梁的装置已经彻底改变了纳米尺度的物质的询问控制和操纵。然而，这种设备的巨大潜力是远远没有被利用。在这个建议中，我们将开发一个创新的方案，其中的微悬臂梁瞬态有效地利用，以获得微秒的时间尺度的样品调查。这种称为瞬态信号成像的新方法将快几个数量级，具有当前动态模式的所有期望特征。这将提供第一个微悬臂梁方法的动态调查在纳米级微秒的时间分辨率。在许多提出的基于微悬臂梁的感测的应用中，如单电子自旋检测，其中目的是在室温下检测单电子自旋，感测不干扰正在观察的现象是必要的。 这类研究的另一个关键特点是，这些力量往往是局部的，可能在相对较大的时间尺度上演变。 该提议的一个创新方面是基于热噪声的方案，其导致在相对大的时间尺度上的最小侵入方式的询问。高灵敏度将通过保持埃尺度的尖端-样品距离和通过控制悬臂尖端处于尖端-样品相互作用势的更温和的吸引机制来实现。这是通过估计其热噪声的微悬臂梁的等效频率来实现的。为了帮助在拟议的调查中开发的创新方法，我们提出了一个紧凑的实验装置，可以利用它来获得微悬臂梁的多模态模型。这种仪器对瞬态信号成像的发展至关重要，并将用于验证和建议未来的战略。微型杠杆正被用于各个领域，影响越来越大，并对科学产生了根本性的影响。这两种方法是使能技术，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。拟议研究的实验方面将与Asylum Research合作完成，Asylum Research是一家领先的生物学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行业之间在该计划中开发的理论和技术的转移。