节点文献
基于表面等离激元光子学的增强光谱研究
【作者】 张正龙；
【作者基本信息】 陕西师范大学 ， 光学， 2013， 博士
【摘要】 利用表面等离激元共振对金属纳米结构局域电磁场的增强作用,调制其附近分子的光学信号行为；通过改变金属纳米结构的大小、构型以及环境介质等因素,在纳米尺度上实现光学信号的有效调控。目前,基于表面等离激元光子学的增强光谱技术,已被广泛应用于超灵敏生物-化学传感、新型光源、高效光学元件、纳米光学成像等领域。本论文从表面等离激元光子学的基本理论出发,理论研究与实验观测相结合,并借助仿真模拟对表面增强光谱技术,特别是针尖增强拉曼散射展开一系列的研究。论文主要内容包括两大部分：一、利用电化学和微纳加工技术,制备纳米孔洞阵列和三维纳米结构,并探究其表面增强荧光效应；采用湿化学方法,合成高产率的聚集体金属纳米颗粒,研究其液相环境中的表面增强荧光和拉曼散射效应,并从理论和仿真模拟上对实验结果进行分析讨论。二、利用高真空针尖增强拉曼散射系统,开展了以下三个方面的研究工作：超灵敏斯托克斯和反斯托克斯拉曼光谱研究,并以此实现了实验温度的原位探测；等离激元催化反应的分子动力学研究,并以此实现了对反应过程的原位调控；针尖增强拉曼光谱中的非线性效应研究。
【Abstract】 The localized electromagnetic field enhancement resulted from the surface plasmon can enhance the optical signals of molecule in the vicinity of metallic substrate surface. Optical signals can be controlled at nanoscale by changing the size, shape and dielectric environment of metallic nanostructure. A powerful technique based on the surface plasmon, surface enhanced spectroscopy has been widely used in biological and chemical sensor, new light source, high efficiency optical sensor, and nano-optical imaging, etc. In this dissertation, properties of suface enhanced spectroscopy and tip enhanced Raman scattering are studied, and some novel physical phenomena has been observed.The dissertation is divided mainly into two parts. First, the surface enhanced fluorescence on nanohole array and three-dimensional nanoparticles is investigated by using electrochemical and micro-nano technology. We also use chemical method to synthesize gold nanoparticle dimers and trimers, and study the enhanced fluorescence and Raman scattering effect in liquid medium theoretically and numerically. Second, both experimental and theoretical studies on the tip enhanced Raman scattering in high vacuum (HV-TERS) are presented. Ultrasensitive Stokes and anti-Stokes Raman signals and local temperature are obtained through HV-TERS. Some interesting phenomena on the plasmon-driven chemical reaction and nonlinear effects in HV-TERS are observed too.