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Study of the surface and far fields of terahertz radiation generated by large-aperture photoconductive antennas
作者姓名:张同意  曹俊成
作者单位:State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
基金项目:Project supported by the Major Projects of the National Natural Science Foundation of China (Grant No 10390162), the Special Funds for Major State Basic Research Project (Grant Nos 2001CCA02800G and G20000683), and the Shanghai Municipal Commission of Science and Technology (Grant Nos 03JC14082 and 011661075).
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.

关 键 词:太赫兹辐射  光电导天线  超快光学技术  电流波动  传输寿命
收稿时间:3/5/2004 12:00:00 AM

Study of the surface and far fields of terahertz radiation generated by large-aperture photoconductive antennas
Zhang Tong-Yi and Cao Jun-Cheng.Study of the surface and far fields of terahertz radiation generated by large-aperture photoconductive antennas[J].Chinese Physics B,2004,13(10):1742-1746.
Authors:Zhang Tong-Yi and Cao Jun-Cheng
Institution:State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
Abstract:We have studied analytically the temporal characteristics of terahertz radiation emitted from a biased large-aperture 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.
Keywords:terahertz radiation  photoconductive antenna  current surge  ultrafast optical techniques
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