Study of the surface and far fields of terahertz radiation generated by large-aperture photoconductive antennas
Zhang Tong-Yi (张同意), Cao Jun-Cheng (曹俊成)
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.
Received: 05 March 2004
Revised: 30 March 2004
Accepted manuscript online:
PACS:
07.57.Hm
(Infrared, submillimeter wave, microwave, and radiowave sources)
(Charge carriers: generation, recombination, lifetime, and trapping)
Fund: 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 Sci
Cite this article:
Zhang Tong-Yi (张同意), Cao Jun-Cheng (曹俊成) Study of the surface and far fields of terahertz radiation generated by large-aperture photoconductive antennas 2004 Chinese Physics 13 1742
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