The physics and technology of low-dimensional electronic systems at terahertz frequencies

太赫兹频率低维电子系统的物理和技术

• 批准号: EP/F029543/1
• 负责人: John Cunningham
• 金额: $ 230.21万
• 依托单位: University of Leeds
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2008
• 资助国家: 英国
• 起止时间: 2008 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FF029543%2F1
• 关键词: physics; technology; low; dimensional; electronic

Over the last 20 years, the study of mesoscopic quantum-confined electronic systems has revealed a wealth of exciting and fundamental physics. These studies show no sign of abating as advances in device fabrication and measurement techniques enable ever more intricate structures and more sophisticated experiments to be made. The characteristic energy scale in many important mesoscopic devices such as two-dimensional electron systems, layered semiconductor structures, semiconductor quantum dots, and laterally-confined wires, dots, and other geometries, corresponds to the terahertz (THz) frequency range (1 THz = 1x10^12 Hz = 4.1 meV), which until recently has been difficult to access. Furthermore, although the majority of studies of mesoscopic systems use dc transport or optical (near-infrared) techniques, invaluable information on the states and dynamics of carriers in condensed matter systems, not obtainable by dc transport methods, can potentially be accessed though the dynamic (high frequency) electronic response. Our vision is to create a step-change in the study of mesoscopic electronic systems by developing and exploiting THz fre-quency technology, and in particular, guided-wave techniques, to probe the THz frequency / picosecond response of quantum-confined electronic systems. We will develop quasi-optical techniques to generate (and detect) single-cycle THz / picosecond electronic pulses adjacent to the mesoscopic system in the cryostat, avoiding the RC bandwidth-limiting problems inherent in previous high frequency (up to the gigahertz range) electrical measurements. We will also develop the methodology to perform picosecond-resolution measurements capable of monitoring the spatial position of single electrons three orders-of-magnitude faster than achieved previously; this will provide a generic technology for the field of mesoscopic physics where the onset of, or change in, a quantum state occurs on a picosecond time scale. This programme, which comprises the symbiotic development of THz frequency science and technology in quantum con-fined electronic systems, will be unique internationally and will open an important new direction for mesoscopic physics.

在过去的20年中，对介质量子限制的电子系统的研究揭示了大量令人兴奋和基本的物理学。这些研究表明，随着设备制造和测量技术的进步使得能够进行更多复杂的结构和更复杂的实验，没有减弱的迹象。许多重要的介质设备中的特征能量表，例如二维电子系统，分层的半导体结构，半导体量子点以及横向限制的电线，点和其他几何形状，对应于Terahertz（Terahertz（Thz）（THz）频率（1 Thz = 1x10^12 Hz = 4.1 mev）此外，尽管对介质系统的大多数研究都采用直流传输或光学（近红外）技术，但是关于凝聚态物质系统中载体的载体和动态的宝贵信息，而不是通过直流传输方法获得的，但可以通过动态（高频）电子响应来访问。我们的视野是通过开发和利用THZ频率技术，尤其是指导波技术来研究介质电子系统的逐步变化，以探测量子限制的电子系统的THZ频率 / Picsecond响应。我们将开发准光学技术来生成（并检测）单周thz / picsecond电子脉冲，与冷冻仪中的介质系统相邻，避免了先前的高频（直至Gigahertz范围）固有的RC带宽限制问题。我们还将开发方法，以执行比以前更快的单个电子阶订单的平地分辨率测量值，以监测单电子的空间位置。这将为介质物理领域提供通用技术，在该领域，量子状态在picsecond Time量表上发生或改变量子状态。该计划包括量子构建的电子系统中THZ频率科学和技术的共生发展，将在国际上是独特的，将为中学物理开辟一个重要的新方向。

项目成果

Terahertz imaging and spectroscopy

太赫兹成像和光谱学

• 发表时间: 2010
• 期刊: EuCAP 2010 - The 4th European Conference on Antennas and Propagation
• 作者: Davies A.G.

Simultaneous measurement of orthogonal components of polarization in a free-space propagating terahertz signal using electro-optic detection

使用电光检测同时测量自由空间传播太赫兹信号中偏振的正交分量

• DOI: 10.1063/1.3579258
• 发表时间: 2011
• 期刊: Applied Physics Letters
• 影响因子: 4
• 作者: Byrne M

Broadband terahertz time-domain spectroscopy of drugs-of-abuse and the use of principal component analysis

• DOI: 10.1039/b817839a
• 发表时间: 2009-01-01
• 期刊: ANALYST
• 影响因子: 4.2
• 作者: Burnett, Andrew D.;Fan, Wenhui;Davies, A. Giles
• 通讯作者: Davies, A. Giles

Free-space terahertz radiation from a LT-GaAs-on-quartz large-area photoconductive emitter.

• DOI: 10.1364/oe.24.026986
• 发表时间: 2016-11
• 期刊: Optics express
• 影响因子: 3.8
• 作者: D. R. Bacon;A. Burnett;M. Swithenbank;C. Russell;Lianhe H. Li;C. Wood;J. Cunningham;E. Linfield;A. Davies;P. Dean;J. Freeman

Terahertz goubau waveguides with integrated photoconductive emitters and mode discriminating detectors

具有集成光电导发射器和模式识别探测器的太赫兹 goubau 波导

• DOI: 10.1109/icimw.2009.5324638
• 发表时间: 2009
• 作者: Dazhang L