MRI: Acquisition of a Short-pulse Ti:Sapphire Laser for Terahertz Studies of Semiconductor Heterostructures

有了这项来自主要研究仪器计划的奖项，麦卡莱斯特学院将能够获得一个短的钛蓝宝石激光器，用于半导体异质结构的太赫兹研究。该激光系统将允许在太赫兹和中红外频率下对材料进行时间分辨光谱分析。 最初的研究将使用该仪器来支持主要研究者的NSF资助计划，以研究半导体中的自旋和电荷动力学（NSF-RUI DMR-0074622）。 项目将包括半导体自旋动力学的超快太赫兹光谱学;半导体磁等离子体振荡的时间分辨测量;以及强驱动半导体量子威尔斯和异质结构中的量子跃迁。 该设备还将支持Macalester学院光子学和凝聚态物理学的本科生研究培训。凭借主要研究仪器计划的这一奖项，Macalester学院将能够获得用于半导体异质结构太赫兹研究的短钛-蓝宝石激光器。随着电子器件中的开关速率被推向更高的频率，理解半导体中皮秒（10- 12 s）和飞秒（10- 15 s）时间尺度上的载流子输运现象变得越来越重要。使用超快太赫兹光谱学，可以用飞秒光脉冲或单周期电磁脉冲激发材料，并及时记录电荷的运动。 该奖项支持设备，使时间分辨光谱的材料在太赫兹和中红外频率。最初的研究将使用该仪器来支持主要研究者的NSF资助计划，以研究半导体中的自旋和电荷动力学（NSF-RUI DMR-0074622）。该设备还将支持Macalester学院光子学和凝聚态物理学的本科生研究培训。

With this award from the Major Research Instrumentation program Macalester College will be able to acquire a short Titanium-Sapphire laser for Terahertz studies of semiconductor heterostructures. The laser system will permit time-resolved spectroscopy of materials at terahertz and mid-infrared frequencies. Initial research will use the instrument to support the Principal Investigator's NSF-funded program to study spin and charge dynamics in semiconductors (NSF-RUI DMR-0074622). Projects will include ultrafast Terahertz spectroscopy of spin-dynamics in semiconductors; time-resolved measurements of magneto-plasma oscillations in semiconductors; and quantum transitions in strongly driven semiconductor quantum wells and heterostructures. The equipment will also support undergraduate research training in Photonics and Condensed Matter Physics at Macalester College.With this award from the Major Research Instrumentation program Macalester College will be able to acquire a short Titanium-Sapphire laser for Terahertz studies of semiconductor heterostructures. As the switching rates in electronic devices are pushed to ever higher frequencies, it becomes increasingly important to understand carrier transport phenomena in semiconductors on picosecond (10-12s) and femtosecond (10-15s) time-scales. Using ultrafast terahertz spectroscopy it is possible to impulsively excite a material with a femtosecond optical pulse or single-cycle electromagnetic pulse, and record the resulting motion of charge in time. This award supports equipment to enable time-resolved spectroscopy of materials at terahertz and mid-infrared frequencies. Initial research will use the instrument to support the Principal Investigator's NSF-funded program to study spin and charge dynamics in semiconductors (NSF-RUI DMR-0074622). The equipment will also support undergraduate research training in Photonics and Condensed Matter Physics at Macalester College.