National Tsing Hua University Institutional Repository:The effects of two-photon absorption on terahertz radiation generated by femtosecond-laser excited photoconductive antennas
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    National Tsing Hua University Institutional Repository > 理學院 > 物理系 > 期刊論文 >  The effects of two-photon absorption on terahertz radiation generated by femtosecond-laser excited photoconductive antennas


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    題名: The effects of two-photon absorption on terahertz radiation generated by femtosecond-laser excited photoconductive antennas
    作者: Chao-Kuei Lee;Chan-Shan Yang;Sung-Hui Lin;Osamu Wada;Ci-Ling Pan
    教師: 潘犀靈
    日期: 2011
    出版者: Optical Society of America
    關聯: Optics Express, Optical Society of America, Vol. 19, Iss. 24, November 21, 2011, pp. 23689–23697
    關鍵詞: Photoconductive materials
    Spectroscopy
    terahertz
    Ultrafast optics
    摘要: Terahertz (THz) radiation can be generated more efficiently from a low-temperature-grown GaAs (LT-GaAs) photoconductive (PC) antenna by considering the two-photon absorption (TPA) induced photo-carrier in the photoconductor. A rate-equation-based approach using the Drude-Lorentz model taking into account the band-diagram of LT-GaAs is used for the theoretical analysis. The use of transform-limited pulses at the PC antenna is critical experimentally. Previously unnoticed THz pulse features and anomalously increasing THz radiation power rather than saturation were observed. These are in good agreement with the theoretical predictions. The interplay of intensity dependence and dynamics of generation of photoexcited carriers by single-photon absorption and TPA for THz emission is discussed.
    URI: http://www.osa.org/
    http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/84028
    顯示於類別:[物理系] 期刊論文

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