光子晶体/贵金属复合结构的表面增强拉曼散射特性及其在单分子检测中的应用

项目名称： 光子晶体/贵金属复合结构的表面增强拉曼散射特性及其在单分子检测中的应用

项目编号： No.11264017

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 刘桂强

作者单位： 江西师范大学

项目金额： 63万元

中文摘要： 表面增强拉曼散射（SERS）在单分子分析检测方面应用前景广阔，但要获得高强度且可重复的SERS信号，基底的制备是一个难点。本项目拟以光子晶体/贵金属（Au、Ag）复合结构为研究对象，研究影响SERS强度和可重复的重要因素，如体系结构、表面结构、缺陷分布、额外增强因子、热点数量和分布等，设计并制备出具有一个或多个热点面的光子晶体/贵金属复合结构，探索复合结构的SERS有别于简单粒子和金属周期结构的特殊性，揭示复合结构的制备-微结构-热点面-SERS的内在联系；研究颗粒大小和形状、各层厚度及各种无序等对SERS的影响，揭示光子晶体表面倏逝场与表面等离子体共振耦合的机制、光子带隙对表面等离子体共振耦合调制的物理本质及SERS产生的物理机制，实现SERS信号的可选择，并探索其在单分子分析检测中的应用。为高强度、可重复SERS基底的制备及基于光子晶体/贵金属复合结构功能器件的设计提供理论和实验依据。

中文关键词： 表面增强拉曼散射；光子晶体；贵金属；单分子；光与物质的相互作用

英文摘要： Surface-enhanced Raman scattering (SERS) has emerged as a promising tool in the detection of single molecules. However, one challege is to fabricate SERS substrates with high-strength and reproducibility of Raman signals. In this project, the photonic crystal/noble metal (Au, Ag) complex structures are chosen to act as the objects of study, and the important factors which contribute to the intensity and reproducibility of SERS are studied, e.g. the system structure, surface structure, distribution of defects, additional enhancement factor, and number and distribution of hot spots,etc. The photonic crystal/noble metal complex structures with one or more than one hot spot plane are designed and fabricated. The unique characteristics of the complex structures which are different from those of the simple metal nanoparticles and metallic periodic structures are explored, and the internal relation between the fabrication-microstructure-hot spot plane -SERS of the complex structures are revealed. The influences of photonic band gaps, evanescent electromagnetic fields near the photonic crystal surface, and surface plasmons on the SERS properites are investigated by tailoring the sizes and shapes of nanoparticles, adjusting the thicknesses of each film in the complex structures, and introducting all kinds of disorders, e

英文关键词： Surface-enhanced Raman scattering；Photonic crystals；Noble metal；Single molecules；Light-matter interaction