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

我们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，并使用近场光检测材料的纳米加工。1)导电聚合物的介观结构采用时间分辨SNOM分析了各种导电聚合物的介观结构。我们发现，混合聚合物体系的结构对湿度有很强的依赖性，并且混合聚合物体系中激发能传递的动力学与体系的相分离结构有关。2)研究了导电聚合物在TiO_2薄膜上电子转移动力学的位置依赖性。结果表明，热处理TiO_2薄膜的电子转移效率最高，与玻璃表面相比，几乎不受电子转移动力学的位置影响，说明了能量迁移和电子转移速率分布的重要性。通过将高NA物镜的局部激发与SNOM系统相结合，我们构建了时间分辨显微系统来测量激发能传递的长度依赖性。4)飞秒瞬态吸收微光谱与纳米加工首次开发了以白光连续体为探测脉冲的飞秒吸收微光谱系统，该系统将未放大的钛蓝宝石激光器引入光子晶体光纤中产生白光连续体。该系统不仅使我们能够在显微镜下测量10^<-7>数量级的非常微弱的吸收变化，而且还可以应用吸收和荧光SNOM。利用悬臂式SNOM技术开发了近场非线性光学光谱系统，分析了微晶体内部的非均质性。此外，还利用近场光证明了薄微晶的纳米加工。5)半导体纳米粒子和纳米线我们已经合成了CdS和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体，并用SNOM对其进行了表征。少

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