高光谱光学近场显微成像方法研究

项目名称： 高光谱光学近场显微成像方法研究

项目编号： No.11304006

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： 蔡微

作者单位： 北京航空航天大学

项目金额： 30万元

中文摘要： 高光谱近场显微成像是将高光谱成像的概念引入到近场光学技术中，利用光学探针逐点收集样品表面形貌和宽带光源激发出的透射/散射光谱，同步形成表面微观形貌像和高光谱像。本课题拟采取理论分析、数值计算和实验相结合的方法对高光谱近场显微成像进行研究，内容包括：首先利用时域有限差分法探讨在宽带激发光源的作用下贵金属纳米结构的光场与不同的近场光学探针的光场在成像过程中的相互作用；然后从实验上发展扫描定位与光谱仪CCD同步控制的成像关键技术以及从光谱数据中同步合成高光谱像的数据处理方法；最后对成像方法进行实验验证，优化各项实验参数条件，实现对特定样品（如：贵金属纳米线等）高光谱像的获取。高光谱像将在空间维和光谱维上展现更丰富的信息，在微纳米尺度上实现金属纳米结构光学现象/效应的可视化，反映研究对象在不同波长下的光学响应。

中文关键词： 扫描近场光学显微术；扫描探针显微术；近场光谱；贵金属纳米结构；光纤探针

英文摘要： Hyperspectral optical near-field imaging introduces the concept of hyperspectral imaging into near-field optical techniques. By using the optical probe, hyperspectral images can be obtained simultaneously with topographic image. The surface topography and transmission/scattering spectrum which excited by the broadband light source are collected point by point. This project intends to make use of theoretical analysis, numerical calculation, and the experiments to research hyperspectral optical near-field imaging method. The research contents are shown as follow. Firstly, the optical properties of noble metal structures and different type of near-field optical probes under the excitation of broadband light source are investigated by the finite difference time domain method. The interactions of optical fields between the tip and the sample during the imaging procedure will be considered in simulations. Then synchronous control of scan positioning and spectrometer CCD are experimentally developed as a key imaging technique, as well as the processing method for building near-field hyperspectral images from the spectral data in the each point of image. Finally, hyperspectral imaging method is demonstrated by experiments with particular samples (e.g., noble metal nanowires). The parameters in experiments are also optim

英文关键词： Scanning near-field optical microscopy；Scanning probe microscopy；Near-field spectrum；Noble metal nanostructures；Optical fiber probes