Edge plasmon mediated tip enhanced spectroscopy

针尖增强光谱(TES)结合了表面增强光谱和近场光学显微镜的概念。TES通常使用金属尖端和外部照明来实现。我们使用了金属涂层的四面体尖端(T-尖端)，内部照明。数值计算表明，T型尖端边缘的等离子体激元边缘模可以作为入射光束超聚焦到高度局域尖端激发的有效通道，也可以作为尖端顶端偶极子发射到尖端的高方向性光束的探测通道。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配置。将探索工商业污水附加费的不同应用。随着对分辨率低于100 nm的表面分子组成分析的迫切需要，TERS(尖端增强拉曼散射)表面成像技术将被用来分析表面的分子组成。此外，涂有拉曼活性分子的T-TIP用作近场拉曼探头，其中探头的TERS信号通过对探头的光谱mm的选择性影响而用作表面属性成像的工具。TIP增强荧光光谱将应用于光合膜制剂的成像。

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.