中国物理B ›› 2004, Vol. 13 ›› Issue (10): 1742-1746.doi: 10.1088/1009-1963/13/10/030

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

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

张同意, 曹俊成   

  1. State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
  • 收稿日期:2004-03-05 修回日期:2004-03-30 出版日期:2005-06-20 发布日期:2005-06-20
  • 基金资助:
    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

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)   

  1. State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
  • Received:2004-03-05 Revised:2004-03-30 Online:2005-06-20 Published:2005-06-20
  • Supported by:
    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

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摘要： 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.

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.

Key words: terahertz radiation, photoconductive antenna, current surge, ultrafast optical techniques

中图分类号:  (Infrared, submillimeter wave, microwave, and radiowave sources)

  • 07.57.Hm
85.60.-q (Optoelectronic devices) 42.65.Re (Ultrafast processes; optical pulse generation and pulse compression) 72.40.+w (Photoconduction and photovoltaic effects) 72.20.Jv (Charge carriers: generation, recombination, lifetime, and trapping)