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Terahertz pulse generation with LT-GaAs photoconductive antenna

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3 Author(s)
L. J. Cui ; Novel Materials Laboratory, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, China 100083, ; Y. P. Zeng ; G. Z. Zhao

Low-temperature-grown GaAs (LT-GaAs) of 1-um thickness was grown at 250degC on semi-insulating GaAs (001) substrate using EPI GEN-II solid-source MBE system. The sample was then in situ annealed for 10 min at 600degC under As-rich condition. THz emitters were fabricated on this LT-GaAs with three different photoconductive dipole antenna gaps of 1-mm, 3-mm, and 5-mm, respectively. The spectral bandwidth of 2.75 THz was obtained with time domain spectroscopy. It is found that THz emission efficiency is increased with decreasing antenna gap. Two carrier lifetimes, 0.469 ps and 3.759 ps, were obtained with time-resolved transient reflection-type pump-probe spectroscopy.

Published in:

2006 Joint 31st International Conference on Infrared Millimeter Waves and 14th International Conference on Teraherz Electronics

Date of Conference:

18-22 Sept. 2006