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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.
Using the Ensemble-Monte Carlo simulation method, the distribution of in-vivo electric field and the space charge shielding effect of semi-insulating GaAs (SI-GaAs) photoconductive switches as dipole radiating antennas in radiated terahertz waves under different experimental conditions The effects of terahertz wave radiation are simulated.The time-domain electric field distribution of carriers shows that the high-energy laser pulse triggers a low-voltage bias GaAs switch, and the space charge shielding is an important factor to limit the terahertz wave radiation power. Space charge shielding can cause the terahertz wave to exhibit bipolarity.When high-energy femtosecond laser pulse triggers a large aperture photoconductive antenna with full electrode gap, the shielding effect of space charge electric field has little effect on the terahertz wave.