高空间分辨SPR“热点”成像研究

The quantitative characterization of SPR induced “hot spots” is the physical foundation for all kinds of SPR-based enhanced surface/interface spectroscopies. This project is mainly committed to the exploration of SPR-induced-hot-spot imaging techniques by use of plasmon-enhanced second-harmonic generation (PESHG) and surface plasmon potential technology. Through making fully use of these techniques in various kinds of nanostructures, i.e., nanoparticle clusters and periodic nano-arrays, we can obtain the quantitative information of SPR induced “hot spots” and further develop the application of SERS and other kinds of enhanced spectroscopies. Combing theoretical analyses with experimental studies, we are dedicated to exploring excitation conditions of “hot spots” in various SPR modes. Based on the fabrication and optimization of SPR-induced-hot-spot imaging substrates, we can systematically develop the research about spatial distributions, maximum enhancements and average effects of SPR induced “hot spots” in nanostructures and provide a quantitative “hot spot” explanation for the sensitivity and spatial resolution of several kinds of spectroscopies. After the completion of the project, some original achievements, including both the basic physical principle of surface plasmon and the development of imaging techniques with high spatial resolution, are expected to obtain. 8 to 10 research papers are expected to be published on international journals with high impact.

金属纳米结构中SPR“热点”的定量表征是发展各类基于表面等离激元共振的高分辨、高灵敏、高精度界面光谱学的物理基础。本项目主要致力于利用近场耦合理论，结合高分辨成像实验的研究方法，发展基于等离激元增强二次谐波（PESHG）及表面等离激元电势效应的SPR“热点”成像技术，实现各类典型纳米结构（如纳米粒子聚集体、周期性纳米阵列）中SPR“热点”信息的超高空间分辨。通过对SPR“热点”的空间分布及强度分布进行定量化表征，希望从源头上推动各类表（界）面增强光谱技术的发展，进而为各类等离激元增强光谱技术的实用化推广奠定基础。项目完成后，有望在界面化学、表面等离激元光学中的基础科学问题及表面超高空间分辨成像技术领域取得原创性成果。本项目预计将在国际权威期刊上发表8至10篇高水平研究论文。

金属纳米结构中SPR“热点”的定量表征是发展各类基于表面等离激元共振的高分辨、高灵敏、高精度界面光谱学的物理基础。本项目主要利用近场耦合理论，结合高分辨成像实验的研究方法，发展了基于表面增强拉曼散射、针尖增强拉曼散射、等离激元增强二次谐波（PESHG）及表面等离激元电势效应的SPR“热点”成像技术，实现了各类典型纳米结构（如纳米粒子聚集体、周期性纳米阵列）中SPR“热点”信息的超高空间分辨。通过对SPR“热点”的空间分布及强度分布进行定量化表征，促进了各类表（界）面增强光谱技术的发展，进而为各类等离激元增强光谱技术的实用化推广奠定了较为重要的科学基础。本项目在国际权威期刊上发表了18篇高水平研究论文，在界面化学、表面等离激元光学中的基础科学问题及表面超高空间分辨成像技术领域取得了部分重要的原创性成果。