Nonlinear Near Millimeter Wave Properties of Semiconducting Heterostructures

一种光泵浦的近毫米波高强度激光器已被 康奈尔大学建造的，用于测量 研究了二维电子气（2- DEG）结构。 一 提出了工业/大学合作研究计划， 在这个仪器周围输入，其中测量是 基于高迁移率2-的远红外非线性特性制成 IBM提供的DEG样本。 一个目标是推动集体 2-高强度远离平衡态的DEG电子模 调谐到自然量子跃迁的共振辐射 频率. 由于研究很少， 然而，关于2-DEG系统的非线性高频特性， 提出了一些不同的实验。 这些包括 饱和测量的子带状态和 在高达11特斯拉的磁场中的回旋共振模式， 识别共振和非共振热电子效应， 倍周期和一种新的二次谐波的观测 预测发生在2-DEG表面层的生成， 在样品中以高强度出现。 的延续 缺陷处持续红外烧孔研究 半导体也提出了努力针对 探测砷化铝镓中DX中心的动力学 以及硅中的双空位。

An optically-pumped, near-mm-wave, high-intensity laser has been constructed at Cornell University for the purpose of measuring the nonlinear susceptibility of two dimensional electron gas (2- DEG) structures in the Terahertz frequency region. A collaborative Industry/University research program is proposed, entered around this instrumentation, in which measurements are made on the far infrared nonlinear properties of high mobility 2- DEG samples provided by IBM. One goal is to drive the collective 2-DEG electronic modes far from equilibrium with high intensity resonant radiation tuned to the natural quantum transition frequencies. Since very little research has been carried out as yet on the nonlinear high frequency properties of 2-DEG systems a number of different experiments are proposed. These include saturation measurements on the sub-band states and on the cyclotron resonance mode in magnetic fields up to 11 Tesla, identification of resonant and nonresonant hot electron effects, observation of period doubling and a new type of second harmonic generation predicted to occur for the 2-DEG surface layer and appears in the sample at high intensities. A continuation of the investigation of persistent IR hole burning at defects in semiconductors is also proposed with effort directed toward probing the dynamic of the DX center in aluminum-gallium-arsenide and the divacancy in silicon.