金属纳米结构避雷针效应与Fano共振及其表面增强拉曼散射应用研究

项目名称： 金属纳米结构避雷针效应与Fano共振及其表面增强拉曼散射应用研究

项目编号： No.11304224

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 张艺

作者单位： 天津工业大学

项目金额： 28万元

中文摘要： 金属纳米结构支持的局域表面等离激元共振是当前国际上热门研究领域，避雷针效应和Fano共振是该领域内的两大研究方向，分别关注于局域电场提高和共振线宽减小。本项目提出结合避雷针效应与Fano共振开展研究的新思路：通过增加尺寸增强避雷针效应，并利用Fano共振抑制与之相伴的辐射衰减而提高局域电场强度；同时利用避雷针效应导致的局域电场增强减小Fano线宽。从理论上设计并优化既具有强避雷针效应又支持Fano共振金属纳米结构，探索高电场增强、低辐射衰减、窄共振线宽的局域表面等离激元共振的基本规律和实现条件。利用电子束曝光，实现金属纳米结构的制备，并以其为基底开展表面增强拉曼散射应用研究。该项目的完成将促进局域表面等离激元电场增强和共振线宽减小的研究进入一个新的水平，提高表面增强拉曼散射的探测灵敏度，并将对纳米光学器件、生物化学传感、高次谐波产生等各个领域产生重要影响。

中文关键词： 局域表面等离激元；Fano 共振；避雷针效应；等离激元受激辐射；等离激元标尺

英文摘要： Local surface plasmon resonance supported by metal nanostructure is a hot research field. Lightning rod effect and Fano resonance are two topics in the field, which concern the local electric field enhancement and resonance linewidth decrease, respectively. The project proposed a new research idea with combining the lightning rod effect and Fano resonance: strengthen the lightning rod effect by increasing the size of metal nanostructure, while suppress the accompanied radiative decay taking advantage of the Fano resonance to improve the local electric field enhancement; decrease Fano linewidth simultaneously by the local electric field enhancement caused by lightning rod effect. Design and optimize metal nanostructures both possessing strong lightning rod effect and supporting Fano resonance, and explore the basic law and condition of surface plasmon resonance with high electric field enhancement, low radiation attenuation, and narrow resonance linewidth. Fabricate metal nanostructures by the electron beam lithography, and study the surface enhanced-Raman scattering with them as the substrates. The project will promote studies of electric field enhancement and resonance linewidth decrease of localized surface plasmon resonance into a new level, improve the Raman scattering detection sensitivity, and have importa

英文关键词： Local surface plasmon；Fano resonance；lightning rod effect；Spaser；plasmon Ruler