Study of the surface and far fields of terahertz radiation generated by large-aperture photoconductive antennas

• 来源期刊: 中国物理（英文版）
• 关键词: terahertz radiation photoconductive antenna current surge ultrafast optical techniques
• 年，卷（期）: 2004,（10）
• 页码范围: 1742-1746
• 页数: 5页
• 语种: 英文

摘要

We have studied analytically the temporal characteristics of terahertz radiation emitted from a biased largeaperture photoconductive antenna triggered by an ultrashort optical pulse. We have included the effects of the finite lifetime and transient mobility dynamics of photogenerated carriers in the analysis. Succinct explicit expressions are obtained for the emitted radiation in the surface field and in the far field. The dependence of the waveforms of the radiated field on the fluence and duration of triggering optical pulse, carrier relaxation time and carrier lifetime are discussed in detail using the obtained expressions.