基于贵金属纳米结构的ZnO回音壁微腔激光辐射特性研究

项目名称： 基于贵金属纳米结构的ZnO回音壁微腔激光辐射特性研究

项目编号： No.11204097

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学I

项目作者： 楚盛

作者单位： 华中科技大学

项目金额： 30万元

中文摘要： ZnO 纳米碟回音壁微腔激光器是一种优秀的微小激光光源，它的优势在于极低的阈值增益和高的腔品质因数，在未来大容量存储器件、光通信和计算、以及细胞生物医学和量子信息领域等有巨大前景。而如何理解微腔与物质的相互作用，提高外场与谐振腔的耦合，以及增强其发光效率是ZnO微纳激光走向应用的关键所在。本课题提出一种使用自组装的规则贵金属纳米颗粒表面等离子体效应调控ZnO纳米碟回音壁微腔的新方法，并拟展开系统研究。将采用气相传输法制备高质量的ZnO纳米碟结构，在其表面使用真空沉积和退火的方法外延生长三角形或六角形的贵金属纳米颗粒。研究贵金属修饰的ZnO 纳米碟复合谐振腔的各种光学特性，并利用泵浦-探测技术探索其超快动力学响应，揭示贵金属和半导体之间相互作用的机理。在上述基础上，着重研究在不同种类、尺寸、分布的贵金属颗粒调控的单光子或双光子激光辐射特性，以期获得低能量阈值、高发光效率、高光束质量的激光。

中文关键词： 氧化锌；纳米盘；回音壁激光器；表面等离基元；纳米线

英文摘要： ZnO nanodisk whispering gallery mode (WGM) micro-cavity is an excellent compact ultraviolet laser source for its low threshold gain and high Q factors. ZnO nanodisk laser is promising in future high volume data storage, optical communications/computing, micro-biomedical treatment, as well as quantum information applications. Key problems involve interaction between micro-cavity and matters, coupling to the external fields, as well as the enhancement of emission efficiencies have to be solved toward the commercialization of ZnO WGM nanolasers. In this project, we propose a novel approach (vacuum deposition plus rapid annealing) to epitaxially grow self-organized triangular or hexagonal noble metal nanostructures, in order to effectively control the optical properties of the ZnO WGM micro-cavity. Pumping-detecting technology will be employed to probe the ultrafast dynamics in the sample, which is important to reveal the interactions and energy transport mechanism between surface plasmons in metal nanostructures and ZnO WGM micro-cavity. Furthermore, the dependence of lasing characteristics in both single photon and two photon absorption cases on the metal composition, sizes of both cavities and metals, together with the distribution of metals on semiconductors, etc will be examined in detail. These results will be

英文关键词： ZnO；nano disc；whispering gallery mode lasing；surface plasmon resonance；nanowire