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.

引用

页数：3

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