基于纳米环的等离激元超表面材料的构筑及其光学性质的研究

On account of the engineering of optical properties of plasmonic metasurface material and distribution of local field, this project aim at fabricate plasmonic metasurface material using nanoring as unit based on strategies of combination of monolayer colloidal lithography, physical deposition and stepwise annealing according to demand, and revealed the mechanism of fabrication of nanoring； Realize the localized surface Plasmon resonance (LSPR) of metasurface material from visible region to near infrared region; set up the relation between characteristic parameter of plasmonic metasurface material and optical properties, distribution of local field based on result of experiment and simulation; revealed the enhancement mechanism of plasmonic metasurface material based on study Surface enhanced Raman Scattering (SERS) effect; design and construct the chip for SERS effect using the obtained plasmonic metasurface material, and realize the portable trace detection of high toxic molecule, and lay the foundation for practicability and device based on plasmonic metasurface material.

针对等离激元超表面材料的光学性质的调控和局域场分布的问题，本项目拟采用单层胶体模板-物理沉积-分步退火处理相结合的策略，按需构筑纳米环为单元的等离激元超表面材料，并揭示纳米环的形成机制；实现超表面材料的局域表面等离激元共振（LSPR）从可见光至近红外区域的合理调控；建立超表面材料结构参数与光学性质、局域场分布之间的关联性；通过研究超表面材料的表面增强拉曼散射（SERS）效应，揭示增强机理；利用所合成材料，设计并构造基于SERS效应的芯片，实现对高毒性分子手持式痕量检测与分析，为等离激元超表面材料的器件化和实用化奠定基础。

环形等离激元结构具体特殊的光学性质，在很多方面具有重要的应用价值。本项目主要开展了三方面的研究内容：（1）基于胶体晶体有序阵列技术与反应离子刻蚀技术相结合，金环形“纳米墙”有序阵列构筑、局域场模拟及其SERS性能研究；（2）在光纤端面上，金银双金属环形“纳米墙”有序阵列构筑、局域场模拟、光纤拉曼光谱仪搭建及其基于SERS效应的远程在线检测研究；（3）利用水热法，合成金“环形”微纳结构颗粒，表面修饰及对六六六分子（HCH）的主动捕获和超灵敏SERS效应研究。显然，本项目的开展可为基于SERS效应的远程、在线痕量检测奠定基础。