Limits and Applications of THz Time-Domain Spectroscopy and THz Coherent Transients

太赫兹时域光谱和太赫兹相干瞬变的局限性和应用

• 批准号: 9422952
• 负责人: Daniel Grischkowsky
• 金额: $ 49.2万
• 依托单位: Oklahoma State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-05-15 至 1999-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9422952&HistoricalAwards=false
• 关键词: Limits; Applications; THz; Time; Domain

Using circuitry which is driven by ultrafast repetitive laser pulses, Dr. Grischkowsky has developed a complete optoelectronic THz beam system which can generate and detect 200 fsec pulses of freely propagating THz radiation with a time resolution of 65 fsec. Based on this optoelectronic THz beam system, he has pioneered the field of THz time- domain spectroscopy (TDS). In this proposal he seeks to explore the limits of THz-TDS with respect to both sensitivity and dynamic range. Transmission measurements requiring extreme dynamic range will be performed on samples such as semiconductors and normal and superconducting metal films as well as hot samples, flames and plasmas. The PI further plans the precise measurement of coherent THz transients from molecular vapors and the direct observation of THz propagation effects through dense vapors.

利用由超快重复激光脉冲驱动的电路，Grischkowsky博士开发了一个完整的光电太赫兹光束系统，可以产生和检测200 fsec的自由传播太赫兹辐射脉冲，时间分辨率为65 fsec。 基于这种光电太赫兹光束系统，他开创了太赫兹时域光谱（TDS）领域的先河。 在这份提案中，他试图探索THz-TDS在灵敏度和动态范围方面的限制。 需要极端动态范围的传输测量将在半导体和正常和超导金属薄膜以及热样品，火焰和等离子体等样品上进行。 PI进一步计划精确测量来自分子蒸气的相干THz瞬变，并直接观察THz通过稠密蒸气的传播效应。