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中文摘要：
利用Ensemble-Monte Carlo模拟方法,对不同实验条件下半绝缘GaAs（SI-GaAs）光电导开关作为偶极辐射天线在辐射太赫兹电磁波（太赫兹波）中体内电场的分布以及空间电荷屏蔽效应对太赫兹波辐射的影响进行了模拟.载流子的时域空间电场分布表明：用高能量激光脉冲触发低压偏置的GaAs开关,空间电荷屏蔽是限制太赫兹波辐射功率的一个重要因素,并且空间电荷屏蔽能够引起太赫兹波呈现双极性.当高能量飞秒激光脉冲以全电极间隙触发大孔径光电导天线时,空间电荷电场屏蔽效应对太赫兹波的影响不大.
英文摘要：
Ensemble-Monte Carlo model is used to simulate the time-resolved spatial electric field distribution and the influence on terahertz emission by screening of the bias field by the space charge in semi-insulated GaAs （SI-GaAs） photoconductive switches under different experimental conditions. The time-resolved spatial electric field distribution of photo-generated carriers shows that space charge screening is one of the important factors that limit high-power terahertz radiation of the biased SI-GaAs photoconductors triggerd by high optical energy pulses, and space charge screening can produce bipolar terahertz waveforms. When large-aperture biased photoconductors are triggerd by uniform gap illumination of high optical energy pulse, the effect of space-charge screening on terahertz radiation is small.
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