项目名称： 表面等离激元塔姆态及其应用研究

项目编号： No.11504184

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 向吟啸

作者单位： 南开大学

项目金额： 24万元

中文摘要： 利用表面等离激元突破衍射极限的特性来实现电磁场高强度聚焦是纳米光子学领域的研究热点之一。申请人从理论上提出了一种新型的电磁场增益模式——表面等离激元塔姆态，这种电磁模式结合了表面等离激元的空间尺寸压缩放大和塔姆态共振增强放大的特性，可实现电磁场的双重增益。表面等离激元塔姆态电磁场增益并不单一的依赖于极端尖锐（<10 nm）的波导末端，可以降低加工成本；其双重电磁场放大特性又能保持极大的强度增益。在此项目中，我们拟以数值模拟为指导，从实验的角度研究表面等离激元塔姆态：通过在亚波长金属间隙波导中引入表面等离激元塔姆结构，再由扫描近场光学显微镜探测其近场分布，研究其场增益特性。进一步的，我们拟研究这种电磁场双重增益在单分子探测方面的应用，将表面等离激元塔姆结构与针尖增强拉曼散射技术相结合，为提高探测灵敏度和电磁场能量利用效率做出有益的尝试。

中文关键词： 表面等离激元；表面等离激元塔姆态；扫描近场光学显微镜；针尖增强拉曼散射

英文摘要： Surface plasmon polaritons have attracted much attentions in the recent years because they are suitable to achieve focusing to length scales smaller than the diffraction limit of light. We propose a novel type of nanoscaled Tamm states for light enhancement which we call plasmonic Tamm states (PTSs). Due to the PTS effects, fields can be enhanced for a second time at the terminal side of the MIM BR on the basis of the dimension confinement. PTSs structure is able to acquire large field enhancement without very sharp waveguide tapered end (< 10 nm), which can reduce the processing cost. In this project we study PTSs experimentally. PTSs structure are fabricated in metal-insulator-metal slot waveguides after parameters are optimized by simulation. The dual enhancement of electromagnetic fields is characterized by scanning near-field optical microscopy. Moreover, PTSs will be applied in Tip-enhanced Raman Scattering, which can focus light more efficiently and improve the detection sensitivity.

英文关键词： Surface Plasmon Polaritons;Plasmonic Tamm States;Scanning Near-field Optical Microscopy;Tip-enhanced Raman Scattering