Semiconductor Carrier Dynamics in Metal-Semiconductor Nanostructures

金属半导体纳米结构中的半导体载流子动力学

• 批准号: 1309989
• 负责人: Gregory Salamo
• 金额: $ 32.99万
• 依托单位: University of Arkansas
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2016-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1309989&HistoricalAwards=false
• 关键词: Semiconductor; Carrier; Dynamics; Metal; Nanostructures

Technical Description: This project is designed to utilize unique materials growth techniques to investigate the optical properties and the underlying science of metal-semiconductor hybrid nanostructures. Photoluminescence spectroscopy and photoluminescence excitation spectroscopy of quantum dots and quantum wells are used to probe the nature of the interaction between surface plasmon polaritons and excitons. The principal investigator and students use these optical techniques to observe and control the coherent transfer of energy across the interface between metal and semiconductor materials, as a function of growth parameters. In addition, frequency-resolved optical gating spectroscopy combined with spectral interferometry yield a sensitive method for temporal characterization. The material systems being studied are silver, gallium, aluminum, and indium metal nanoparticles and indium arsenide and indium gallium arsenide quantum wells and dots. The research project designs, fabricates, characterizes and investigates the origin of the linear and non-linear optical behavior of hybrid metal-semiconductor nanostructures.Non-technical Description: In its simplest form, a surface plasmon polariton is an electromagnetic wave that is guided and confined along a metal-dielectric interface much in the same way that light can be guided by an optical fiber. This confinement leads to an intense electromagnetic field at the interface, resulting in an extraordinary enhancement of materials properties. This is particularly true when the separation between metal and dielectric materials is at the nanoscale. In this project, using novel materials fabrication techniques, the functionality of metal-semiconductor hybrid nanostructures is increased to demonstrate control of light waves on a nanometer length scale and ultra-short optical switching times. As a result, the confined nature of propagating surface plasmon polariton waves enables all-optical integrated circuits. One can imagine tiny active photonic elements based on nonlinear surface plasmon polariton optics that allows propagation and switching of nanoscale light beams confined by the metal-semiconductor interface. In addition to the potential for technology impact, the project gives students the skills to design and fabricate nanostructures, characterize their morphology and utilize their data to question and advance the understanding of the exciton-surface plasmon polariton coupling. In this way, students uncover novel and useful optical behavior while learning exciting techniques in both continuous wave and ultra-fast optical spectroscopy.

技术说明：本计画旨在利用独特的材料成长技术来研究金属-半导体混合奈米结构的光学性质及相关科学。量子点和量子威尔斯阱的光致发光光谱和光致发光激发光谱被用来探测表面等离子激元与激子之间相互作用的本质。主要研究者和学生使用这些光学技术来观察和控制金属和半导体材料之间界面的能量相干转移，作为生长参数的函数。此外，频率分辨光学选通光谱与光谱干涉相结合，产生一个敏感的方法的时间特性。正在研究的材料系统是银、镓、铝和铟金属纳米颗粒以及砷化铟和砷化铟镓量子威尔斯和量子点。该研究项目设计、制造、表征和调查混合金属-半导体纳米结构的线性和非线性光学行为的起源。非技术描述：在其最简单的形式中，表面等离子体激元是一种电磁波，其被引导和限制沿着金属-电介质界面，就像光可以被光纤引导一样。这种限制导致界面处的强电磁场，从而导致材料性能的非凡增强。当金属和电介质材料之间的分离处于纳米级时，这尤其如此。在这个项目中，使用新的材料制造技术，增加了金属-半导体混合纳米结构的功能，以展示在纳米长度尺度上对光波的控制和超短的光开关时间。因此，传播的表面等离子体激元极化激元波的受限性质使全光集成电路成为可能。人们可以想象基于非线性表面等离子体激元光学的微小有源光子元件，其允许由金属-半导体界面限制的纳米级光束的传播和切换。除了潜在的技术影响外，该项目还为学生提供了设计和制造纳米结构的技能，表征其形态，并利用其数据来质疑和促进对激子-表面等离子体极化激元耦合的理解。通过这种方式，学生发现新颖和有用的光学行为，同时学习连续波和超快光谱学中令人兴奋的技术。