CAREER: Time-Resolved Nonlinear Terahertz Spectroscopy

职业：时间分辨非线性太赫兹光谱

• 批准号: 9500614
• 负责人: Xi-Cheng Zhang
• 金额: $ 24万
• 依托单位: Rensselaer Polytechnic Institute
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-08-01 至 1999-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9500614&HistoricalAwards=false
• 关键词: CAREER; Time; Resolved; Nonlinear; Terahertz

This research project proposes the development of a novel source of ultra-intense, ultrashort pulsed electromagnetic radiation for time-resolved terahertz (Thz) spectroscopy. This table-top radiation source will emit subpicosecond electromagnetic pulses with Thz bandwith and gigawatt (GW) peak power. The technique consists of using an amplified femtosecond laser beam to illuminate a large-aperture semiconducting emitters, and to generate electromagnetic radiation produced by the rapid current transients due to optical injection of free carriers into the static electric fields associated with the semiconductor surfaces and interfaces. Since the energy carried by submillimeter-wave pulses is derived mainly from the electrostatic energy capacitively stored at the surface rather than from the incident laser energy, the total energy of the radiation can well exceed the incident of the laser beam. The academic proposal results from a need to develop a new curriculum for the Optical Physics Program at Rensselear. A pilot program is being developed to improve student learning and motivati on through computer-based interactive teaching using graphics, multi-media, numerical simulations, and hands-on experiments. The proposed Advanced Optoelectronic Laboratory for undergraduates will be furnished with state-of-the-art equipment and instrumentation. A computer-assisted Modern Optics Teaching Room is under construction. Undergraduate student research participation is strongly emphasized to tightly couple experimental and class work activities.

该研究项目提出了一种用于时间分辨太赫兹(THz)光谱的新型超强、超短脉冲电磁辐射源的开发。该桌面辐射源将发射太赫兹带宽和吉瓦(GW)峰值功率的亚皮秒电磁脉冲。这项技术包括使用放大的飞秒激光照射大口径半导体发射体，并产生电磁辐射，这是由于自由载流子被光学注入到与半导体表面和界面相关的静电场中而产生的快速电流瞬变。由于亚毫米波脉冲携带的能量主要来自表面电容存储的静电能量，而不是入射激光能量，因此辐射的总能量可以远远超过激光的入射能量。学术建议的结果是需要为伦赛尔的光学物理项目开发一个新的课程。正在开发一项试点计划，通过使用图形、多媒体、数值模拟和动手实验的基于计算机的互动教学来改善学生的学习和动机。拟建的本科生先进光电实验室将配备最先进的设备和仪器。正在建设一个计算机辅助的现代光学教学室。大力强调本科生的研究参与，将实验和课堂工作紧密结合起来。