权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Study on high-density excited states and optical processes in semiconductor nanostructures by spatial-and time-resolved spectroscopy

通过空间和时间分辨光谱研究半导体纳米结构中的高密度激发态和光学过程

基本信息

批准号：
18340089
负责人：
KANEMITSU Yoshihiko
金额：
$ 10.33万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

We studied fundamental optical properties and high-density excited states in semiconductor nanostructures by means of space- and time-resolved laser spectroscopy. We explored novel optical functionalities in unique semiconductor nanostructures such as nanoparticle quantum dots, impurity-doped nanoparticles, and carbon nanotubes. These semiconductor nanostructure samples are inhomogeneous systems in the sense that they have broad distributions of size and shape and variations of surface structure and surrounding environment. Space- and time-resolved optical spectroscopy makes it possible to understand intrinsic optical properties and inherent optical functionalities of nanostructures. First, we developed the fabrication methods of nanoparticle and nanotube samples and the techniques of space- and time-resolved laser spectroscopy. Using these sample preparation and optical spectroscopic techniques, we studied high-density excited states in semiconductor nanostructures. We improved our laser spectroscopy systems for optical measurements at wide spectral region and temperatures and also developed a new spectroscopic system by the integration of an optical microscope with a femtosecond laser. We further investigated the photoluminescence spectra and dynamics under the high-density excitation in semiconductor nanostructures including semiconductor nanoparticles, impurity-doped' nanoparticles, silicon nanowires, carbon nanotubes, and bulk mixed crystal samples. We discussed the exciton many-body effects and high-density excitation effects in low-dimensional semiconductor nanostructures.

我们研究了半导体纳米结构的基本光学性质和高密度激发态的空间和时间分辨激光光谱。我们探索了独特的半导体纳米结构，如纳米粒子量子点，掺杂纳米粒子和碳纳米管的新的光学功能。这些半导体纳米结构样品是不均匀的系统，因为它们具有宽的尺寸和形状分布以及表面结构和周围环境的变化。空间和时间分辨光谱学使人们有可能了解纳米结构的内在光学性质和内在光学功能。首先，我们发展了纳米粒子和纳米管样品的制备方法以及空间和时间分辨激光光谱技术。利用这些样品制备和光学光谱技术，我们研究了半导体纳米结构中的高密度激发态。我们改进了我们的激光光谱系统，用于在宽光谱区域和温度下进行光学测量，并通过将光学显微镜与飞秒激光器集成开发了一种新的光谱系统。我们进一步研究了半导体纳米颗粒、掺杂纳米颗粒、硅纳米线、碳纳米管和块状混晶样品在高密度激发下的光致发光光谱和动力学。讨论了低维半导体纳米结构中的激子多体效应和高密度激发效应。