Study on surface plasmon thermal wave microscopy for evaluation of thermal characteristics in metal thin films

表面等离子体热波显微镜评估金属薄膜热特性的研究

基本信息

批准号：
11650032
负责人：
TOKUNAGA Yoshiaki
金额：
$ 1.92万
依托单位：
Kanazawa Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650032/
关键词：
Thermal wave Microscopy Nonradiative surface plasmon Metal thin film Attenuated total reflection Laser Photoacoustic effect クレツチマン法反射率レーザー逆問題

项目摘要

Since 1990, we have carried out the development of a compact photoacoustic (thermal wave) microscope and the study on its application to material science because it has great capability of nondestructive evaluation and imaging of inner cracks and defects in opaque materials. Unfortunately, it was difficult to employ for evaluation of thin films of metals such as silver, gold, and aluminum since these materials do not form strong heat source because they have high reflectivity for visible light. In this research project, Grant-In-Aid for Scientific Research (C), we propose a new capability of photoacoustic microscopy for metal films using nonradiative surface plasmon. First, we developed a surface plasmon thermal wave (SPTW) microscope system. This system made up three systems ; the first is a system for the conversion of the surface plasmon into the thermal wave the second is a system for surface plasmon measurement, and the final is a system for thermal wave measurement. These systems were controlled functionally and effectivelly by a personal computer. Using this system we measured that the frequency dependence on amplitude of the photoacoustic signal in films of the silver, the gold, and the capper when the modulation frequency of the laser beam was changed continuously from 100Hz to 1000Hz. The obtained -0.9 dependence closed with -1.0 dependence (theoretical prediction and experimental evidence) in the bulk sample cases.

自1990年以来，我们已经开发了紧凑的光声（热波）显微镜以及对材料科学应用的研究，因为它具有无损评估以及对不透明材料中内部裂缝和缺陷的成像的极大能力。不幸的是，很难用于评估银，金和铝等金属的薄膜，因为这些材料不会形成强大的热源，因为它们对于可见光具有很高的反射率。在该研究项目的科学研究赠款（C）中，我们提出了使用非放射性表面等离子体的金属膜的光声显微镜的新能力。首先，我们开发了一个表面等离子体热波（SPTW）显微镜系统。该系统组成了三个系统；第一个是将表面等离子体转化为热波的系统，第二个是表面等离子体测量的系统，最终是用于热波测量的系统。这些系统在功能和有效的控制下由个人计算机控制。使用该系统，我们测量了当激光束的调制频率从100Hz连续更改为1000Hz时，在银，金和帽子中光声信号振幅的频率依赖性。在批量样本案例中，获得的-0.9依赖性在-1.0依赖性（理论预测和实验证据）上封闭。