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Development of near field laser induced ablation spectroscopy

近场激光诱导烧蚀光谱学的发展

基本信息

批准号：
14350443
负责人：
FUJINAMI Masanori
金额：
$ 9.54万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350443/
关键词：
Near field optics Mass spectrometry Nano technology Emission spectroscopy Time of flight Metal tip Ablation Light ionization 飛行時間型質量分析

项目摘要

The aim of the research project is to develop the near-field laser induced ablation spectroscopy and to analyze the chemical composition to detect the atomic emission within 100 nmφ area. The problem is to overcome the diffraction limit of light and confine the ablation area induced by laser beam. Our idea is to utilize the tip enhanced field with femtosecond pulse laser beam and such a enhanced field is effective within several tens nanometer. We expect that the excited atoms and ions emit characteristic light after ablation and information on chemical composition is obtained.Near-filed optical scanning microscope has been installed by ourselves. Pulsed femtosecond light with 800 nm and 150 fs pulse width is used as an excitation light, and irradiates the W. tip. It has been found that irradiation with 13 mJ/cm^2 induces the ablation area with 50 nm width and 10 nm depth for Au and Al thin films on a glass. Without W tip in irradiation, no ablation takes place. This ablation area is beyond the diffraction limit and a combination with femtosecond pulse laser and tip-enhanced field is effective to induce nano-area ablation. On the other hand, no light emission has been observed. It is considered for the reason that pulse light is too. short to excite the ablated atoms and ions. Further, optimization of optical geometry is needed.In this research, we have also developed the photothermal scanning near field optical microscope (PT-SNOM). The lateral resolution is enhanced to 200 nm. PT-SNOM can be applied to detect the non-fluorescent molecules, which are inactive to biomaterials. Further, tip enhanced photothermal effect can be found out and the apertureless PT-SNOM can be installed.

本课题的研究目的是发展近场激光诱导烧蚀光谱，分析化学成分，探测100 nmφ范围内的原子发射。问题是克服光的衍射极限，限制激光束引起的烧蚀区域。我们的想法是利用飞秒脉冲激光束的尖端增强场，这种增强场在几十纳米内有效。我们期望被激发的原子和离子在烧蚀后发出特征光，并获得化学成分的信息。自行安装了近场光学扫描显微镜。以800 nm、150 fs脉宽的脉冲飞秒光作为激发光照射w尖。结果表明，在13mj /cm^2的辐照下，玻璃表面的Au和Al薄膜可形成50 nm宽、10 nm深的烧蚀区。无W尖照射，不发生烧蚀。该烧蚀区域超出了衍射极限，飞秒脉冲激光和尖端增强场的结合可以有效地诱导纳米区域烧蚀。另一方面，没有观测到光发射。它被认为是脉冲光也是的原因。激发烧蚀的原子和离子。此外，还需要对光学几何结构进行优化。在这项研究中，我们还开发了光热扫描近场光学显微镜（PT-SNOM）。横向分辨率提高到200nm。PT-SNOM可用于检测对生物材料无活性的非荧光分子。此外，还发现了针尖增强的光热效应，并可以安装无孔PT-SNOM。