Transient Optical Studies of Non-equilibrium Excitations in Semiconductors and Energy Transfer Processes in Ionic Crystals

半导体非平衡激发和离子晶体能量转移过程的瞬态光学研究

• 批准号: 9301100
• 负责人: Kong-Thon Tsen
• 金额: $ 26.5万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-08-15 至 1998-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9301100&HistoricalAwards=false
• 关键词: Transient; Optical; Studies; Non; equilibrium

9301100 Tsen This experimental program will study the dynamics of carriers in semiconductors under extreme non-equilibrium conditions. A second sub-project will investigate energy transfer processes in ionic crystals. Sub-picosecond time-resolved Raman spectroscopy will be used to examine carrier transport under electic fields. The technique provides a direct, simple interpretation of the experimental results, which will provide conclusive fundamental information on ballistic transport as well as velocity overshoot phenomena predicted theoretically in nanostructured semiconductors. Study of various energy transfer processes in ionic crystals by time-resolved Raman spectroscopy should provide direct information about vibrational-to-vibrational energy transfer processes in a model solid state system. %%% This experimental program will study the dynamics of semiconductor electrons moving under the influence of high electric fields. A second project will investigate how energy is transferred among the various modes of vibration in an ionic crystal when it absorbs light. The information is of fundamental significance and is also of technological significance. It will aid in the design of better and faster semiconductor devices of micron and submicron dimensions. The energy transfer processes are immediately relevant to the design and utility of far infrared lasers used in photonics and telecommunications applications. ***

9301100 Tsen该实验计划将研究极端非平衡条件下半导体中载流子的动力学。 第二个子项目将研究离子晶体中的能量转移过程。 亚皮秒时间分辨拉曼光谱将用于研究电场下载流子的输运。 该技术提供了一个直接的，简单的解释的实验结果，这将提供结论性的基本信息弹道传输以及速度过冲现象理论预测在纳米结构半导体。 通过时间分辨拉曼光谱研究离子晶体中的各种能量转移过程应该提供有关模型固态系统中振动到振动能量转移过程的直接信息。 这个实验项目将研究在高电场影响下半导体电子运动的动力学。 第二个项目将研究当离子晶体吸收光时，能量如何在离子晶体的各种振动模式之间转移。 信息具有基础性意义，也具有技术性意义。 它将有助于设计更好、更快的微米和亚微米尺寸的半导体器件。 能量转移过程与光子学和电信应用中使用的远红外激光器的设计和实用性直接相关。 ***