CAREER: III-nitrides Nanowire Superlattice for Nanoscale Laser Diodes

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。技术概述：本CAREER项目的主要目标是了解纳米结构设计和材料特性之间的相互作用，并使用实验和建模相结合的方法来定义半导体纳米线光学结构的基本问题，目标是展示独立的纳米线注入激光器。本项目由以下相关子项目组成：1)纳米线激光结构的合成与建模。本文将合成以多量子点（MQDs）为有源介质、分布式布拉格反射器（DBR）为光反馈结构的氮化氮轴向调制纳米线结构。将进行三维建模来预测纳米线增益介质和光学腔的特性作为线尺寸，形态，DBR和mqw设计的函数。2)通过系统的光学表征和建模，开发了优化的纳米线激光器结构，并进行了光泵浦纳米线激光器的实验演示。研究了激光阈值及其与纳米线结构的关系。3)纳米线电子性能研究及载流子注入新方案的开发。4)独立式注射纳米线激光器的研制。对激光阈值和发射波长的调制进行了研究。非技术概述：该项目是一项变革性研究，旨在解决电子/光子材料科学中具有技术相关性的基础研究问题。该项目有望促进对纳米结构设计与基本特性之间相互作用的理解，并为光电器件开辟大量机会，这可能会广泛影响电子、光子学和能量转换技术。该项目是跨学科的，不仅为学生提供全面的研究训练，而且促进了强有力的跨部门/机构和国际合作。该项目还加强了研究和教育活动的结合。PI计划通过结合纳米科学研究开发新的讲座、研讨会和实验室课程。外展参观工业材料研究实验室和组织公众和行业参与教育计划是计划活动的重要组成部分。此外，PI计划促进UCSC的独立本科生研究，以招募和培养未来的年轻科学家，特别是代表性不足的学生和非博士学生。授予机构和社区学院。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).TECHNICAL SUMMARY:The primary objectives of this CAREER project are to understand the interplay of nanostructure design and material properties, and use a combined experimental and modeling approach to define fundamental issues of semiconductor nanowire optical structures with the goal of demonstrating free-standing nanowire injection lasers. The project is comprised of the following interrelated subprograms: 1) Synthesis and modeling of nanowire laser structures. III-nitrides axial modulated nanowire structures, with multiple-quantum-dots (MQDs) as active medium and distributed Bragg reflector (DBR) as an optical feedback configuration, will be synthesized. Three-dimensional modeling will be performed to predict the properties of nanowire gain medium and optical cavity as a function of wire size, morphology, DBR and MQWs design. 2) Development of an optimized nanowire laser structure via systematic optical characterization and modeling, and experimental demonstration of an optically pumped nanowire laser. Lasing threshold and its dependence on nanowire structure will be studied. 3) Investigation of nanowire electronic properties and development new scheme for carrier injection. 4) Development of a free-standing injection nanowire laser. The modulation of lasing threshold and emission wavelength will be studied. NON-TECHNICAL SUMMARY:The project is transformative research that addresses fundamental research issues in electronic/photonic materials science having technological relevance. The project is expected to advance the understanding of the interplay between nanostructure design and fundamental properties, and opens up substantial opportunities in optoelectronic devices, which could impact extensively the technology of electronics, photonics and energy conversion. The project is multidisciplinary, which not only provides comprehensive research training for students, but also promotes strong cross-department/institution and international collaboration. The project also enhances the integration of research and educational activities. The PI plans to develop new lectures, seminar and laboratory courses by incorporating nanoscience research. Outreach visits to industrial materials research labs and organizing public and industry participation in the education program is an important part of the planned activities. In addition, the PI plans to promote independent undergraduate research in UCSC to recruit and train future young scientists, in particular underrepresented students and students from non-Ph.D. granting institution and community college.