Collaborative Research: Quantum Dot Nucleation In Glass Microsphere Resonators

合作研究：玻璃微球谐振器中的量子点成核

• 批准号: 0444257
• 负责人: Subhash Risbud
• 金额: $ 21.68万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-08-15 至 2008-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0444257&HistoricalAwards=false
• 关键词: Collaborative; Research; Quantum; Dot; Nucleation

This research is a collaborative project with Prof. Brongersma of Stanford University to study the laser induced nucleation of semiconductor quantum dot (QD) nanocrystals in glass microspheres. CO2 laser beam processing will be used to melt the tip of a glass fiber resulting in microsphere formation and subsequent nucleation of QDs. Preliminary results show that we can form CdTe QDs in microspheres (10 mm - 200mm diameter) by this method. The main goal of this research is to investigate the nucleation and growth characteristics to enable controlled processing and nanostructure formation in the glass microsphere geometry. The semiconductor quantum dots in the microspheres will be characterized by electron microscopy (SEM, TEM, HRTEM), small angle X-ray scattering (SAXS), and ultra-sensitive optical spectroscopies that exploit the high Q optical resonances of the microsphere. In these optical modes, light can orbit around the equator of the microsphere for millions of times allowing multiple sampling and strong interaction with the nanoparticles in the sphere. We will develop the procedures for using microspheres as "optical microtest laboratories" and provide general recipes for studying a wide variety of nucleation and growth phenomena glass microspheres.The project provides a strong science base to nanotechnologies based on optical devices made from materials containing semiconductor nanocrystals in glass microspheres. It also has important practical applications such as ultra-compact and tunable light sources and lasers. The graduate educational program will include under-represented groups.

本研究是与斯坦福大学的Brongersma教授的合作项目，研究半导体量子点（QD）纳米晶体在玻璃微球中的激光诱导成核。CO2激光束加工将用于熔化玻璃纤维的尖端，从而形成微球并随后形成量子点的核。初步结果表明，该方法可以制备出直径为10 mm -200 mm的CdTe量子点微球。本研究的主要目标是研究成核和生长特性，以实现在玻璃微球几何形状中的受控加工和纳米结构形成。微球中的半导体量子点将通过电子显微镜（SEM、TEM、HRTEM）、小角X射线散射（SAXS）和利用微球的高Q光学共振的超灵敏光学光谱来表征。在这些光学模式下，光可以围绕微球的赤道运行数百万次，从而允许多次采样并与球体中的纳米颗粒发生强烈的相互作用。我们将开发使用微球作为“光学显微实验室”的程序，并提供研究各种玻璃微球成核和生长现象的通用配方。该项目为基于玻璃微球中含有半导体纳米晶体的材料制成的光学器件的纳米技术提供了坚实的科学基础。 它也有重要的实际应用，如超紧凑和可调光源和激光器。研究生教育计划将包括代表性不足的群体。