Barnes M E, Berry S A, Gow P, McBryde D, Daniell G J, Beere H E, Ritchie D A, Apostolopoulos V
School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, United Kingdom.
Opt Express. 2013 Jul 15;21(14):16263-72. doi: 10.1364/OE.21.016263.
Pulses of coherent terahertz radiation can be efficiently generated by a lateral diffusion current after ultrafast generation of photo-carriers near a metal interface on the surface of a semiconductor, this is known as the lateral photo-Dember effect. We investigate how the emission depends on the pump spot position, size, power and how it is affected by the application of an applied external bias. We study the role of the metallic mask and how it suppresses emission from the carriers diffusing under it due to a reduction of available radiation states both theoretically and experimentally.
在半导体表面金属界面附近超快产生光载流子后，横向扩散电流可高效产生相干太赫兹辐射脉冲，这被称为横向光丹伯效应。我们研究了发射如何依赖于泵浦光斑位置、尺寸、功率以及它如何受到施加的外部偏置的影响。我们从理论和实验两方面研究了金属掩膜的作用以及它如何由于可用辐射态的减少而抑制在其下方扩散的载流子的发射。
