Surface Effects and Pump-Probe Studies of Nanowire Waveguides

纳米线波导的表面效应和泵浦探针研究

• 批准号: 26191210
• 负责人: Professor Dr. Tobias Voß
• 金额: --
• 依托单位: Institut für Halbleitertechnik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/26191210?language=en
• 关键词: Surface; Effects; Pump; Probe; Studies

Nanowires and nanorods made of zincoxide (ZnO) are promising building blocks for future optoelectronic devices operating in the near-UV spectral region. By vapour-phase epitaxy (VPE) nanorods with excellent optical quality and carefully adjustable lengths and diameters can be grown on different substrates. A new low-temperature technique which uses aqueous chemical growth (ACG) for the fabrication of large-scale nanorod arrays provides fascinating possibilities like using flexible plastic substrates. In this project the linear and non-linear optical properties of nanorod ensembles grown by ACG and VPE on different substrates will be systematically analyzed. Emphasis will be put on the possibility of using nanorod samples on transparent substrates as highly efficient non-linear optical devices like frequency doublers. Time-resolved measurements will provide insight into the microscopic processes occurring in ACG nanorods under pulsed optical excitation which up to now have not been addressed in the literature. These experiments should especially explain the role and nature of surface states for the optical properties of this new kind of material. Finally, it will be experimentally analyzed if the growth of nanorods using ACG on metallic layers decreases the lasing threshold in such devices thus allowing for efficient coherent laser emission under optical pumping.

由氧化锌（ZnO）制成的纳米线和纳米棒是未来在近紫外光谱区域工作的光电器件的重要组成部分。通过气相外延技术（VPE），可以在不同的衬底上生长出具有优异光学质量和可调节长度和直径的纳米棒。一种新的低温技术，利用水化学生长（ACG）制造大规模纳米棒阵列，提供了像使用柔性塑料衬底一样迷人的可能性。本项目将系统分析ACG和VPE在不同衬底上生长的纳米棒系统的线性和非线性光学特性。重点将放在透明基板上使用纳米棒样品作为高效率非线性光学器件的可能性，如倍频器。时间分辨的测量将提供深入了解在脉冲光激发下ACG纳米棒中发生的微观过程，这到目前为止还没有在文献中得到解决。这些实验尤其应该解释表面态在这种新型材料光学特性中的作用和性质。最后，实验分析了在金属层上使用ACG生长纳米棒是否会降低这种器件中的激光阈值，从而允许光泵浦下有效的相干激光发射。