Modeling of terahertz pulse generation from LT-GaAs ultrafast photoconductive switches  

作　　者：Zhe Ma ongmei Ma Chuntao Yang Keming Feng 

机构地区：[1]Beijing Institute of Radio Metrology and Measurement,Beijing 100854,P.R.China [2]eijing Institute of Electronic System Engineering,Beijing 100854,P.R.China

出　　处：《Journal of Systems Engineering and Electronics》2011年第3期373-380,共8页系统工程与电子技术（英文版）

摘　　要：The technique of terahertz pulses generated from the photoconductive switches has been applied in the ultrafast electrical pulse metrology recently.A lumped-element theoretical model is established to describe the performance of the LT-GaAs ultrafast photoconductive switch used in the ultrafast pulse standard.The carrier transport processes of the photoexcited semiconductor,the attenuation and dispersion during terahertz pulse propagating are considered in the theoretical model.According to the experimental parameters,the waveforms of the generated terahertz pulses are calculated under optical excitations with different wavelengths of 840 nm and 450 nm,respectively.And comparisons between the theoretical results and the experimental results are carried out.The technique of terahertz pulses generated from the photoconductive switches has been applied in the ultrafast electrical pulse metrology recently.A lumped-element theoretical model is established to describe the performance of the LT-GaAs ultrafast photoconductive switch used in the ultrafast pulse standard.The carrier transport processes of the photoexcited semiconductor,the attenuation and dispersion during terahertz pulse propagating are considered in the theoretical model.According to the experimental parameters,the waveforms of the generated terahertz pulses are calculated under optical excitations with different wavelengths of 840 nm and 450 nm,respectively.And comparisons between the theoretical results and the experimental results are carried out.

关 键 词：terahertz pulse photoconductive switch coplanar waveguide LT-GaAs. 

分 类 号：TN304.23[电子电信—物理电子学] X131.3[环境科学与工程—环境科学]