Coulomb and radiation screening in photoconductive terahertz sources

被引：57
作者：
Kim, DS [1 ]
Citrin, DS
机构：
[1] Georgia Inst Technol, Sch Elect & Comp Engn, Atlanta, GA 30332 USA
[2] Georgia Tech Lorraine, F-57070 Metz, France
来源：
APPLIED PHYSICS LETTERS | 2006年 / 88卷 / 16期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1063/1.2196480
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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 similar to 100 mu m as the crossover point beyond which radiation effects dominate screening.
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