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Time-and Space-Resolved Scanning Probe Microscopy Study and Nano Processing.

时间和空间分辨扫描探针显微镜研究和纳米处理。

基本信息

批准号：
13305059
负责人：
TAMAI Naoto
金额：
$ 8.82万
依托单位：
Kwansei Gakuin University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

We have developed multifunctional scanning near-field optical microscopy(SNOM) systems that can measure transient absorption and excitation energy transfer, and also examined the nano processing of materials using near-field light.1)Mesoscopic structure of the conductive polymerMesoscopic structures of various conductive polymers were analyzed by time-resolved SNOM. We have found that the structures are strongly dependent on the humidity, and the dynamics of excitation energy transfer in mixed polymer systems have correlated with the phase separation structure of the system.2)The electron transfer to TiO_2Position dependence of the electron transfer dynamics of conductive polymers on TiO_2 thin film was investigated. It was found that electron transfer efficiency on heat-treated TiO_2 thin film was the best one, almost no position dependence on electron transfer dynamics in contrast to the glass surface, suggesting the importance of energy migration and the distribution of the rate con … More stant of electron transfer.3)The excitation energy transferBy combining the local excitation with high NA objective lens and SNOM system, we have constructed the time-resolved microscopy system to measure the length-dependence on the excitation energy transfer.4)Femtosecond transient absorption microspectroscopy and nano processingFemtosecond absorption microspectroscopy system with white-light continuum as a probe pulse was developed for the first time, in which the un-amplified Ti : sapphire laser was introduced into photonic crystal fiber to generate white-light continuum. This system enables us not only to measure very weak absorption change of the order of 10^<-7> under a microscope but also to apply absorption and fluorescence SNOM. Near field nonlinear optical spectroscopy system using cantilever type SNOM is also developed, and heterogeneity inside microcrystals was elucidated. In addition, nano processing of thin microcrystal was demonstrated by near-field light.5)Semiconductor nanoparticle and nanowireWe have synthesized CdS and CdTe nanoparticles and CdTe nanowire. Photophysical properties of these systems were analyzed by picosecond〜femtosecond laser spectroscopy. Organic nanocrystals were also synthesized by reprecipitation and laser ablation methods and characterized by SNOM. Less

我们已经开发了多功能扫描近场光学显微镜（SNOM）系统，可以测量瞬态吸收和激发能量转移，也可以使用近场光研究材料的纳米加工。1）导电聚合物的介观结构通过时间分辨的SNOM分析了各种导电聚合物的介观结构。发现体系的结构对湿度有很强的依赖性，混合高分子体系中激发能转移动力学与体系的相分离结构相关。2）电子向TiO_2的转移研究了导电高分子在TiO_2薄膜上的电子转移动力学的位置依赖性。结果表明，热处理后的TiO_2薄膜上的电子转移效率最高，与玻璃表面相比，电子转移动力学几乎不受位置的影响，这表明能量迁移的重要性和电子转移速率常数的分布 ...更多信息 3）激发能转移通过将局域激发与高NA物镜透镜和SNOM系统相结合，我们构建了时间分辨显微系统，测量了激发能转移的长度依赖性。4）飞秒瞬态吸收显微光谱和纳米加工首次开发了以白光连续谱作为探测脉冲的飞秒吸收显微光谱系统，其中，未放大的钛宝石激光器被引入光子晶体光纤，以产生白光连续谱。该系统使我们不仅能够在显微镜下测量非常微弱的吸收变化<-7>，而且还可以应用吸收和荧光SNOM。研制了悬臂梁式近场非线性光学显微镜近场非线性光学光谱系统，阐明了微晶体内部的非均匀性。此外，我们还利用近场光技术实现了对薄微晶的纳米加工。5）半导体纳米粒子和纳米线我们合成了CdS、CdTe纳米粒子和CdTe纳米线。利用皮秒-飞秒激光光谱分析了这些体系的光物理性质。采用再沉淀法和激光烧蚀法合成了有机纳米晶，并用SNOM对其进行了表征。少