Time behavior of field screening effects in small-size GaAs photoconductive terahertz antenna

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• 作者：Tianyi Wang (1)
  Zhengang Yang (1)
  Si Zou (1)
  Kejia Wang (1)
  Shenglie Wang (1)
  Jinsong Liu (1)
  
• 关键词：GaAs photoconductive (PC) antenna ; field screening effects ; terahertz (THz) emitter
• 刊名：Frontiers of Optoelectronics in China
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：8
• 期：1
• 页码：98-103
• 全文大小：796 KB
• 参考文献：1. Auston D H, Cheung K P, Smith P R. Picosecond photoconducting Hertzian dipoles. Applied Physics Letters, 1984, 45(3): 284鈥?86 CrossRef
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  3. Tonouchi M, Kawasaki N, Yoshimura T, Wald H, Seidel P. Pump and probe terahertz generation study of ultrafast carrier dynamics in low-temperature grown-GaAs. Japanese Journal of Applied Physics, 2002, 41(Part 2, No. 6B): L706鈥揕709 CrossRef
  4. Siebert K J, Lisauskas A, L枚ffler T, Roskos H. Field screening in low-temperature-grown GaAs photoconductive antennas. Japanese Journal of Applied Physics, 2004, 43(3): 1038鈥?043 CrossRef
  5. Yano R, Gotoh H, Hirayama Y, Miyashita S. Systematic pumpprobe terahertz wave emission spectroscopy of a photoconductive antenna fabricated on low-temperature grown GaAs. Journal of Applied Physics, 2004, 96(7): 3635鈥?638 CrossRef
  6. Loata G C, Thomson M D, L枚ffler T, Poskos H C. Radiation field screening in photoconductive antennae studied via pulsed terahertz emission spectroscopy. Applied Physics Letters, 2007, 91(23): 232506-1鈥?32506-3 CrossRef
  7. Pedersen J E, Lyssenko V G, Hvam J M, Jepsen P U, Keiding S R, Sorensen C B, Lindelof P E. Ultrafast local field dynamics in photoconductive THz antennas. Applied Physics Letters, 1993, 62(11): 1265鈥?267 CrossRef
  8. Jacobsen R H, Birkelund K, Holst T, Jepsen P U, Keiding S R. Interpretation of photocurrent correlation measurements used for ultrafast photoconductive switch characterization. Journal of Applied Physics, 1996, 79(5): 2649鈥?657 CrossRef
  9. Jepsen P U, Jacobsen R H, Keiding S R. Generation and detection of terahertz pulses from biased semiconductor antennas. Journal of the Optical Society of America B, Optical Physics, 1996, 13(11): 2424鈥?436 CrossRef
  10. Loata G C. Investigation of low-temperature-grown GaAs photoconductive antennae for continuous-wave and pulsed terahertz generation. Dissertation for the Doctoral Degree. Frankfurt: Universit盲tsbibliothek Frankfurt am Main, 2007
  
• 作者单位：Tianyi Wang (1)
  Zhengang Yang (1)
  Si Zou (1)
  Kejia Wang (1)
  Shenglie Wang (1)
  Jinsong Liu (1)
  
  1. Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China
  
• 刊物类别：Engineering
• 刊物主题：Electronic and Computer Engineering
  Electromagnetism, Optics and Lasers
  Biomedical Engineering
  Chinese Library of Science
  
• 出版者：Higher Education Press, co-published with Springer-Verlag GmbH
• ISSN：2095-2767

文摘

The field screening effects in small-size GaAs photoconductive (PC) antenna are investigated via the well-known pump and probe terahertz (THz) generation technique. The peak amplitude of the THz pulses excited by the probe laser pulse as a function of the pump-probe time delay was measured. An equivalent-circuit model was used to simulate the experimental data. Based on the good agreement between the results of simulation and experiment, the time behavior of the radiation and space-charge fields was simulated. The results show that the space-charge screening dominantly determines the device response in the whole time, while the radiation filed screening plays a key role in initial time which strongly affects the peak THz field. The parameter analysis was performed, which may be valuable on the optimum design for the antenna as a THz emitter.