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，并利用近场光研究了材料的纳米加工。1）导电聚合物的介观结构各种导电材料的介观结构通过时间分辨SNOM对聚合物进行了分析，我们发现其结构强烈依赖于湿度，并且混合聚合物体系中激发能量转移的动力学与体系的相分离结构相关。2）电子研究了TiO_2薄膜上导电聚合物电子转移动力学的位置依赖性，发现经过热处理的TiO_2薄膜上的电子转移效率是最好的，与传统薄膜相比，电子转移动力学几乎没有位置依赖性。玻璃表面，表明能量迁移的重要性以及电子转移速率常数的分布。3）激发能量转移通过将局部激发与高NA物镜和SNOM系统相结合，我们构建了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，其中无放大钛：蓝宝石激光器被引入光子晶体光纤中以产生白光连续谱，该系统使我们不仅能够测量非常微弱的吸收变化。 10^<-7>在显微镜下也可应用吸收和荧光SNOM，还开发了使用悬臂式SNOM的近场非线性光学光谱系统，并阐明了微晶体内部的异质性。 5）半导体纳米颗粒和纳米线我们合成了CdS和CdTe纳米颗粒以及CdTe纳米线的光物理性质。通过皮秒到飞秒激光光谱分析了这些系统，还通过再沉淀和激光烧蚀方法合成了有机纳米晶体，并通过 SNOM 进行了表征。