Edge plasmon mediated tip enhanced spectroscopy

边缘等离子体介导的尖端增强光谱

• 批准号: 167438810
• 负责人: Dr. Ulrich Fischer
• 金额: --
• 依托单位: Physikalisches Institut
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/167438810?language=en
• 关键词: Edge; plasmon; mediated; tip; enhanced

Tip enhanced spectroscopy (TES) combines the concepts of surface enhanced spectroscopy and near field optical microscopy. TES is often realised with a metal tip and an external illumination. We used a metal coated tetrahedral tip (T-tip) with an intemal illumination. We showed by numerical calculations, that a plasmon edge mode of the edges of the T-tip can serve as an efficient channel for the super focusing of an incident beam of light to a highly localized tip excitation as well as a detection channel for the emission of a dipole at the tip apex into a highly directional beam of light into the tip. A TES configuration will be realized which takes full advantage of these excitation and detection channels in order to increase the sensitivity of TES. Different applications of TES will be explored. As there is an urgent need for the analysis of the molecular composition of surfaces with a resolution below 100 nm, imaging of surfaces by TERS (Tip Enhanced Raman Scattering) will be expolored to analyze the molecular composition of surfaces. In addition, T-tips which are coated with Raman active molecules serve as a Near Field Raman Probe where the TERS signal of the probe is used as a tool for imaging of surface properties by their selective influence on the probe's TERS spectmm. Tip enhanced fluorescence spectroscopy will be applied to imaging of photosynthetic membrane, preparations.

尖端增强光谱学（TES）结合了表面增强光谱学和近场光学显微镜的概念。TES通常通过金属尖端和外部照明来实现。我们使用金属涂层四面体尖端（t尖）与内部照明。我们通过数值计算表明，t尖边缘的等离子体边缘模式可以作为入射光束超聚焦到高度局部化的尖端激发的有效通道，以及在尖端尖端的偶极子发射到高度定向的光束到尖端的探测通道。为了提高TES的灵敏度，将实现一种充分利用这些激励和检测通道的TES结构。本课程将探讨工商业污水附加费的不同应用。由于迫切需要在100 nm以下分辨率下分析表面的分子组成，我们将探索利用尖端增强拉曼散射（Tip Enhanced Raman Scattering）对表面进行成像来分析表面的分子组成。此外，涂有拉曼活性分子的t尖用作近场拉曼探针，其中探针的TERS信号通过其对探针的TERS光谱的选择性影响被用作表面特性成像的工具。尖端增强荧光光谱将应用于光合膜的成像、制备。

项目成果

Near-field photochemical and radiation-induced chemical fabrication of nanopatterns of a self-assembled silane monolayer

自组装硅烷单层纳米图案的近场光化学和辐射诱导化学制造

• DOI: 10.3762/bjnano.5.156
• 发表时间: 2014
• 期刊: Beilstein Journal of Nanotechnology
• 影响因子: 3.1
• 作者: U.C. Fischer;C. Hentschel;F.Fontein;L. Stegemann;C. Hoeppener;H. Fuchs;S. Hoeppener
• 通讯作者: S. Hoeppener