纳米间隙耦合增强表面等离子体共振扫描显微镜的研制及应用

项目名称： 纳米间隙耦合增强表面等离子体共振扫描显微镜的研制及应用

项目编号： No.21273182

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 周剑章

作者单位： 厦门大学

项目金额： 86万元

中文摘要： 当入射光光子频率与金属纳米粒子或者金属纳米结构表面的表面电子震荡的自然频率匹配时即发生局域表面等离子体共振（LSPR）。在合适的激发光频率和偏振状态下，当金属纳米粒子之间或与金属纳米结构的间距达到数纳米时，由于近场耦合效应，"热点"处的局域电磁场的增强系数可高达数百万倍。当金属纳米粒子材料、尺寸和环境确定时，LSPR峰强度和波长位移与间距呈特定的函数关系。因此，本课题拟运用这种函数关系以测定纳米粒子或者纳米粒子与纳米结构之间的间距，研制基于这一原创思想的纳米间隙耦合增强表面等离子体共振扫描显微镜- - Z方向的空间分辨率达10~1 nm- - 并尝试用于研究双电层结构、吸脱附等表界面性质。

中文关键词： 局域表面等离激元共振；纳米核壳结构；光纤探针；有孔SNOM探针；介电传感

英文摘要： Localized surface plasmon resonance (LSPR) occurs when the frequency of light photons matches the natural frequency of surface electrons oscillating against the restoring force of positive nuclei in metal nanoparticles or nanostructures. When the gap between nanoparticles or nanoparticle and nanostructure is several nanometers, in the case of exciting light with appropriate frequency and polarization state, the local electromagnetic field at the hot-spot can be enhanced to million times due to the effect of near-field coupling. LSPR intensity will be enhanced and extinction wavelength maximum shifts with the nano-gap, and presents a specific functional relationship. Conversely, this functional relationship can be used to determine the gap distance between nanoparticles or nanoparticle and nanostructure. Based on this innovative principle, we will develop a technique defined as Nano-gap Coupling Enhanced Surface Plasmon Resonance Scanning Microscopy with a Z-axis resolution of 10~1 nm, and investigate the surface and interfacial properties such as the electric double-layer structure, adsorption and desorption.

英文关键词： Localized Surface Plasmon Resonance；nano core-shell structure；optical fibre probe；aperture SNOM probe；dielectric sensing