Low-temperature-grown GaAs (LT-GaAs) of 1-um thickness was grown at 250 °C 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 600 °C 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 obtaind 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.


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    Title :

    Terahertz pulse generation with LT-GaAs photoconductive antenna


    Contributors:
    Cui, L. J. (author) / Zeng, Y. P. (author) / Zhao, G. Z. (author)


    Publication date :

    2006-09-01


    Size :

    1043691 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English




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