Coulomb and radiation screening in photoconductive terahertz sources
Coulomb and radiation screening in photoconductive terahertz sources
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DOI：
10.1063/1.2196480
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发表时间：
2006-04
影响因子：
4
通讯作者：
D. Kim;D. Citrin
中科院分区：
文献类型：
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作者：
D. Kim;D. Citrin
我们区分了光电导 GaAs 太赫兹 (THz) 源中电子-空穴对超快光生后电磁场库仑和辐射部分的屏蔽贡献。我们采用自洽的蒙特卡罗方法，包括麦克斯韦方程组来研究激发光斑尺寸和激发能级对发射的太赫兹辐射的影响，并找到一系列合理的激发能级，激发光斑直径~100μm作为交叉点，超过该交叉点辐射效应将主导筛选。
We distinguish the screening contributions due to the Coulomb and radiation parts of the electromagnetic field subsequent to the ultrafast photogeneration of electron-hole pairs in photoconductive GaAs terahertz (THz) sources. We employ the Monte Carlo method self-consistently including the Maxwell equations to study the effects of the excitation-spot size and excitation level on the emitted THz radiation, and find for a range of reasonable excitation levels an excitation-spot diameter of ∼100μm as the crossover point beyond which radiation effects dominate screening.