量子点/ZnO光学微腔复合体系的制备及其光谱调制的研究
文献类型：学位论文
| 作者 | 詹劲馨 |
| 学位类别 | 硕士 |
| 答辩日期 | 2014 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 张龙 |
| 关键词 | 氧化锌 量子点 复合光学微腔 荧光光谱 |
| 其他题名 | Investigation on preparation and spectral modulation of Quantum Dots/ZnO composite microcavity |
| 中文摘要 | 对自发辐射的控制是量子光学的核心技术，能够广泛应用于理论研究如光与物质相互作用的弱耦合效应范围内放大自发辐射和强耦合区内实现自发辐射的可逆过程，以及新型光电器件如微型激光器、单光子光源及光电振荡器的研发等。为实现这些物理效应研究及开发应用，将发光物质与光学微腔耦合则是实现控制自发辐射的有效途径。本文基于量子点与半导体光学微腔的优异性质，选取油相核壳结构量子点与ZnO光学微腔系统，系统地研究ZnO光学微腔与II-VI族核壳结构胶体量子点的有效复合以及微腔对量子点发光的低维调制现象。 第一章首先综述了“调控光的自发辐射”这一物理课题的起源以及发展历史，随后对该课题的最新研究进展和现状进行了文献综述，最后，提出该课题的选题依据和研究思路。 第二章介绍了ZnO的结构和光学性质以及目前制备ZnO光学微腔的常用生长技术及其相应的生长机制。其次，分别描述了两种不同结构ZnO微腔晶体的制备、相关性能及生长机理。其中第一种微腔结构为ZnO微米棒，我们采用传统的碳热还原技术，制备出表面光滑，形状规则，具有规则正六边形截面的单晶ZnO微米棒，并在实验上直接给出该结构室温下微腔调制的荧光光谱物理图像；另一种结构为ZnO微米管，我们首次采用水辅助碳热还原技术，制备出表面光滑，形状规则的六边形截面ZnO微米管，并且实现了不同壁厚ZnO微米管晶体的可控生长。通过不同反应时间下样品形貌的生长变化，提出了一种生长气氛影响晶面生长的新的ZnO生长机理。此外针对不同壁厚半径比的ZnO管，我们分别得到了不同的光谱调制信号，由此分析了不同类型管内可能存在的共振模式，结合差分拟合数值理论模拟，给出了相应的理论解释。两种ZnO微米结构光学微腔都展现出非常好的对光场的低维调控能力，为量子点与ZnO光学微腔的研究打下基础。 第三章介绍了量子点的物理概念、性质以及常用的制备方法。我们使用简单的一锅法合成了高品质II-VI族核壳结构胶体量子点。量子点分散性好、晶体质量高且发光效率高、光谱半峰宽窄。详细探讨了不同条件对合成的量子点的光谱性质的影响，制备出450-750 nm波段可调谐油相核壳结构量子点，为后续复合微腔的制备和研究做好准备。 第四章介绍了CdSe/ZnxCd1-xS量子点和ZnO微米棒的复合及其复合微腔调制的光谱研究。我们采用多次浸润的方法将油相量子点均匀的复合在ZnO微米棒微腔的表面，复合微腔体系光谱中ZnO和量子点的发光都受到微腔的调制，通过对比实验证明量子点发光进入到ZnO微腔中，并且受到微腔回音壁共振模式的调制。 第五章是本论文的结论部分，概括了全文的实验研究结果和后续的研究计划。 |
| 英文摘要 | The control of spontaneous emission is the core technology of quantum optics, which can be extensively utilized in theoretical research like Light-Matter Interaction from applied spontaneous emission in the weak-coupling regime to the reversible spontaneous emission in the strong- coupling regime, and in the applications such as miniature lasers, single-photon sources and optoelectronic electronic oscillator (OEO) and so on. To realize such applications, coupling light sources to a suitable dielectric environment provides an ideal approach. Considering the excellent properties of Quantum Dots (QDs) and semiconductor oxide optical microcavity, we adopted the core-shell QDs/ZnO microcavity composite system to investigate the modulation of the QDs spectrum in the ZnO microcavity. Firstly, the background and development of “control of spontaneous emission” was introduced, then the present status and progress about that research topic was reviewed. Finally, we proposed the technical route and research content on this work. In the chapter two, properties and the current preparation，as well as the growth mechanism, of ZnO optical microcavity were briefly introduced. Synthesis, performance measuring and growth mechanism of two kinds of ZnO micro-sturcture were respectively presented. One of them is ZnO microrod with smooth surface and regular shape, which is prepared using traditional carbon thermal reduction technology, besides, their modulated spectrum was detected in room temperature. The other one is ZnO microtubes with smooth surface and the cross section of hexagon, which were synthesized by a water assisted carbon thermal reduction method. Some special microtubes with super-thin wall were firstly obtained. We investigate the products at different stage during the reaction and proposed a novel growth mechanism of these special microtubes. At last, the varied spectra of the microtubes with different ratio of wall thickness to the radius were obtained. Combined with theoretical modulations, we analyzed possible light pathes limited in different microtubes. These two kinds of ZnO microsturctures can be used as microcavities, which laid the foundation for the following QDs/ZnO composite microcavity. In the third part, the concept, properties and common preparation approaches of Quantum Dots were introduced. We synthesized high- quality core/shell QDs using a one-pot colloidal method. The products were highly dispersed, well crystallized and with the narrow PL FWHM. Through a series of experiments, we investigated the affection of the reaction conditions on the spectra property of QDs, and obtained high- quality QDs under optimum conditions, which good preparations for the composites. In the fourth part, the composite of CdSe/ZnxCd1-xS QDs and ZnO microcavity and the related PL were studied. A novel route was utilized to get the QD bonded to the ZnO surface. The PL of the composite product showed obvious resonator mode, and it is demonstrated that the fluorescence of QDs are limited and modulated in the ZnO microcavity. The last part is a conclusion of this dissertation, which generalized the research results of the study and pointed out following works. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16845]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 詹劲馨. 量子点/ZnO光学微腔复合体系的制备及其光谱调制的研究[D]. 中国科学院上海光学精密机械研究所. 2014. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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